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There are three effects that may be important in producing this trend. First, lowtemperature oxidation preferentially affects the finer single-domain magnetites responsible for the Hopkinson peak, which is therefore suppressed in the more oxidized loams. Second, the possible production of uniaxial magnetite with shape anisotropy can also lead to a relatively muted Hopkinson peak. There is, additionally, a third alternative, and the one preferred here, that the natural alteration processes involved in pedogenic susceptibility enhancement have probably depleted the supply of ironbearing precursor phases, so that less new magnetite is formed on heating.

产生这种特殊热磁性质的可能原因如下：第一，成土过程中的低温氧化作用减弱了磁铁矿的Hopkinson效应；第二，可能是成土过程中生成的一向延长的针状磁铁矿颗粒表现出较弱的Hopkinson效应；第三，随着成土作用增强，现代黄土、黑垆土中的硅酸盐、粘土矿物因受土壤化作用分解而越来越少，加热过程中分解产生的磁铁矿造成的磁化率增强相对于其初始磁化率也就越来越小，从而产生越来越弱的Hopkinson/alteration峰，本文认为这是最主要的原因。

A young elephant nuzzles its mother during a visit to the drought-depleted Zambezi riverbed.

一只年轻的大象用鼻子紧挨它的母亲当一次对干旱枯竭的赞比西河河床的访问。

A young elephant nuzzles its mother during a visit to the drought-depleted Zambezi riverbed.

一只小象将鼻子插入它的妈妈的嘴内，当探访那干渴的赞比亚河床。

A young elephant nuzzles its mother during a visit to the drought-depleted Zambezi riverbed.

一只小象将鼻子插入它的妈妈的嘴内要喝水，当访问在那干渴的赞比亚河床。

Photo of the Day: Animal Mothers and Babies A young elephant nuzzles its mother during a visit to the drought-depleted Zambezi riverbed.

意译：动物的妈妈和婴儿们。一只小象将鼻子插入它的妈妈的嘴内，当探访那干渴的赞比亚河床。

The ultramafic rocks outcropped at the Altyn region are all harzburgites. Remant grains of primary minerals have melted residual texture and elastic deformation texture under high temperature and pressure. The whole-rock analyses show their low TiO〓 contents (0.01～0.04%), low Al, Ca and high MgO contents and wide Mg〓 range (89.35～95.57). Rare earth patterns have two types, namely tabacco pipe-shped and LREE-shaped, of which the former is often seen. The chondrite-nomalized Yb values of these analyses are all lower than 1. The spinels have low Ti and high Cr content and most spinels have Cr# higher than 60. All of the above characteristics show that the ultramafic rocks in the Altyn fault zone are components of metmorphic peridotites of ophiolite from depleted mantle source and most ophiolites from this zone belong to supra-subduction zone type ophiolite with a few mid-ocean ridge basalt type.

阿尔金露头区的超基性岩全为方辉橄榄岩，残余的新鲜矿物颗粒发育有熔融残余结构和高温高压下塑性变形结构，全岩分析显示样品TiO〓的含量低，为0.01～0.04％，具有低的Al和Ca，MgO含量高，Mg〓为89.35～95.57；稀土配分型式有两种，即烟斗型和LREE亏损型，前者占绝大多数，Yb球粒陨石标准化后的值全都小于1；尖晶石低Ti高Cr，大部分尖晶石的Cr〓大于60，上述特征说明阿尔金超基性岩是蛇绿岩的地幔橄榄岩成员，来自亏损的地幔源区，阿尔金蛇绿岩大多属于俯冲带之上型蛇绿岩，有少量的大洋中脊型蛇绿岩。

Using this method, it is shown that the chromium-depleted zone consists of layersof continuously varying chromium contents and passivating properties.

在不同电位下测定J-t曲线并对所得溶液进行分析的结果表明，贫Cr层是由贫Cr程度不等的连续区域组成的。

He said that "the 17-Article Agreement was imposed on Tibet under armed force";"the Hans have massacred 1.2 million Tibetans";"owing to Han immigration, the Tibetans have become a minority in Tibet";"the Communists in Tibet force women to practice birth control and abortion"; the government opposes religious freedom and persecutes religious people; traditional Tibetan culture and art are in danger of extinction; the natural resources in Tibet have been seriously depleted; there is severe environmental pollution in Tibet, etc.

达赖在出国后的三十多年里，不顾事实，编造了大量诸如&'十七条协议'是武力逼迫下强加给西藏的&；&汉人屠杀了120万藏人&；&由于汉人移民，藏族在西藏成了少数&；&共产党在西藏强行对妇女实行计划生育、堕胎&；政府反对宗教自由，迫害宗教人士；藏族传统文化艺术遭到灭绝危险；西藏自然资源受到严重破坏；西藏环境受到污染等等谎言，蓄意挑拨民族关系，煽动西藏群众反对中央政府。

Ignoring facts, the Dalai Lama fabricated numerous lies to sow dissension among the various nationalities and incite the Tibetan people to oppose the central government during his 30-year self-exile abroad. He said that "the 17-Article Agreement was imposed on Tibet under armed force";"the Hans have massacred 1.2 million Tibetans";"owing to Han immigration, the Tibetans have become a minority in Tibet";"the Communists in Tibet force women to practice birth control and abortion"; the government opposes religious freedom and persecutes religious people; traditional Tibetan culture and art are in danger of extinction; the natural resources in Tibet have been seriously depleted; there is severe environmental pollution in Tibet, etc. The riots in Lhasa from September 1987 to March 1989 were incited by the Dalai clique and plotted by rebels who were sent back to Tibet. The riots incurred severe losses to the lives and property of Tibetans.

达赖在出国后的三十多年里，不顾事实，编造了大量诸如&'十七条协议'是武力逼迫下强加给西藏的&；&汉人屠杀了120万藏人&；&由于汉人移民，藏族在西藏成了少数&；&共产党在西藏强行对妇女实行计划生育、堕胎&；政府反对宗教自由，迫害宗教人士；藏族传统文化艺术遭到灭绝危险；西藏自然资源受到严重破坏；西藏环境受到污染等等谎言，蓄意挑拨民族关系，煽动西藏群众反对中央政府。1987年9月至1989年3月拉萨发生的多起骚乱事件，就是在达赖集团的煽动和派遣回藏的叛乱分子策划下挑起的，这些骚乱给西藏人民的生命财产造成严重损失。

Photosynthesizing communities living in coastal recharge areas preferentially fix 12C, such that the biomass is typically over 20% depleted in 13C relative to the marine inorganic C reservoir.

海岸补偿地区的营光合作用的生物群落更多的固定了12C，所以富含这种生物量的地区通常记录了相对海洋无机碳超过20%的缺乏13C。

In her eyes, because that is the doorway toher heart * the place where love resides.

女人的漂亮必須從她的眼睛中去看，因為那是她心靈的窗戶和愛居住的地方

I will send some postcards to you.

我会向你发送一些明信片。