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The numerator in this fractional designation is known as the diametral pitch and controls the pitch diameter; the denominator, which is always double the numerator, is known as the stub pitch and controls the tooth depth.

在这一系列的分数中的分子是径节，径节的大小决定了节圆的直径；而分数中的分母通常是分子的两倍，分母是残余径节，它的作用是控制齿槽的深度。

Tooth Proportions.—There are 17 pitches: 2.5/5, 3/6, 4/8, 5/10, 6/12, 8/16, 10/20, 12/24, 16/32, 20/40, 24/48, 32/64, 40/80, 48/96, 64/128, 80/160, and 128/256. The numerator in this fractional designation is known as the diametral pitch and controls the pitch diameter; the denominator, which is always double the numerator, is known as the stub pitch and controls the tooth depth. For convenience in calculation, only the numerator is used in the formulas given and is designated as P. Diametral pitch, as in gears, means the number of teeth per inch of pitch diameter.

齿比——一共有17种齿比：2.5/5，3/6，4/8，5/10，6/12，8/16，10/20，12/24，16/32，20/40，24/48，32/64，40/80，48/96，64/128，80/160和128/256在这一系列的分数中的分子是径节，径节的大小决定了节圆的直径；而分数中的分母通常是分子的两倍，分母是残余径节，它的作用是控制齿槽的深度为了方便计算，在所有的公式中都使用分子作为计算参数，并且与齿轮的表示方式一样定义为径节P尺寸，也就是在节圆上，每英寸长度上的齿数

Ginkgo biloba, large deciduous trees, gymnosperms, dioecism, Billing Division of the single genus, also known as ginkgo, maidenhair tree, duck foot son,tree is an ancient and magical tree species, for China unique.are relict plant Ginkgo biloba, known as the "living fossil."

银杏，落叶大乔木，裸子植物，雌雄异株，单科单属，又称白果、公孙树、鸭脚子、鸭掌树，是一种古老而神奇的树种，为中国所特有。银杏是孓遗植物，被称为"活化石"。

Similarly, over the last 30 years flame-retardant chemicals known as polybrominated diphenyl ethers have been widely used, although little is known about their broader effects.

类似地，在过去的30年里，像我们知道的多溴二苯醚等阻燃化学药剂也被广泛应用，但我们并不了解它们具有的其他功能。

Diptera is a fly Tephritidae, is an important fruit and vegetable pests are known to the world more than 4000 kinds of fruit flies, known in China about 400 kinds of fruit flies, the danger of fruit and vegetable crops or pose a potential threat to an important type of account More than 50 countries provided for in quarantine fly nearly 20 categories.

实蝇属双翅目实蝇科，是重要的果蔬害虫，全世界已知实蝇4000多种，我国已知实蝇约 400种，危险性或对果蔬作物构成潜在威胁的重要种类计50余种，各国规定的检疫实蝇类近20种。

This down-home wisdom is well known and generally practiced by experienced operators because if they don't practice it, they are soon known as former operators.

这个质朴无华的智慧，很多人都知道，经验老道的交易者也都身体力行，因为如果他们不奉行，很快就会成为"先前的"交易者。

Bass drums known as "drum group","drum kit", commonly known as Lesson.

爵士鼓亦称"组鼓"、"套鼓"，俗称"架子鼓"。

The craggy peak formerly known as South Sky Pillar (which was also known as Heaven and Earth Pillar) was rechristened 'Avatar Hallelujah Mountain' at an official ceremony in the Wulingyuan national park Monday.

周一举行的官方仪式上，武陵源国家公园正式将这座原名"南天一柱"的陡峭山峰更名为"阿凡达哈里路亚山"。

Reaction of 24 Einkorn accessions to mixed inoculum of powdery mildew and stripe rust,and two T.urartu accessions UR204,UR206 and a T.monococcum accession MO205 were used for reaction to a set of 15 differential Blumeria graminis tritici isolates and 21 differential Puccinia striiformis isolates,respectively.Among them,UR206 was resistant to all 15 isolates,UR204 was resistant to 14 isolates except E11,and MO205 showed different resistant types.The results indicated that most likely UR206 and UR204 carried new powdery mildew resistance genes that were different from 18 known Pm genes and MO205 carried new stripe rust gene that were different from 24 known Yr genes.

本研究对24份一粒小麦分别进行了白粉病和条锈病混合菌种苗期接种鉴定，进一步分别用一套白粉病菌菌株(15个)对2份乌拉尔图小麦和条锈病菌小种(21个)对1份栽培一粒小麦进行接种鉴定，其中乌拉尔图小麦UR206能抵抗所有供试白粉菌菌株，UR204除对白粉菌菌株E11感病外，对其余菌株表现抗性；栽培一粒小麦MO205对不同条锈菌小种表现出不同的抗性反应，研究表明乌拉尔图小麦UR206、UR204和栽培一粒小麦MO205分别含有与已知抗白粉病和抗条锈病基因不同的新基因。

There is one kind of phenomenon appearing during children's psychological development, namely,children start to split from the integral relationship with their mothers at the age of three and cast their emotion onto their fathers, they even go so far as to compete with their mothers for enjoying their fathers exclusively, this is known as the Oedipus Complex, also known as Electra Complex[2], it was fair to say that Sijia actually had the Electra Complex.

儿童心理发展有一种现象，即到了3岁时开始从自己和母亲的一体关系分裂出来，并且把情感投在父亲身上，甚至要和母亲竞争而独占父亲，称为俄底浦斯情结，又叫恋父情结[2]。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。