第一步

In this thesis,MWNTs were modified firstly using concentrated acid of H_2SO_4 and HNO_3,and then octadecyl isocyanate was grafted onto the surface of the MWNTs to improve the dispersion and the interaction between the filler and the matrix.

第一步，用浓硫酸和浓硝酸的混合液对MWNTs进行酸化处理，第二步，用廉价的十八烷基异氰酸酯对酸化过的MWNTs进行烷基化处理。

The second step is that the needle-like β-FeOOH particles dissolve and recrystallize to form α-Fe2O3 particles.

第一步是氢氧化铁转化为针状的β-FeOOH粒子；第二步是针状的β-FeOOH粒子溶解再结晶形成α-Fe2O3微粒。

The best reaction conditions of the second step was confirmed by the orthogonal experiment. Its yield was 90.5% when the reagents were refluxed for 3.0 h at 120℃.

第一步反应很快，回流30 min即可；通过正交试验得出第二步反应的最佳条件为：反应体系在120℃回流3.0h，产物的产率为90.5%。

Firstly, powder was made out of the 19 samples respectively by pounding, abrading and screening and became what I Call the parent materials manufacturing soil'.

人造土壤的制作过程分三步进行。第一步将19个样品分别捣碎、研磨、筛选制成粉末，我称它们为&造土母质&。

The first step was esterifying FFA to its methyl esters. The second step was transesterifying the triglycerides in the products of the first step to methyl esters and glycerol.

第一步为酸催化预酯化反应，主要是将地沟油中的游离脂肪酸转化为脂肪酸甲酯；第二步为酸催化转酯化反应，主要是进一步将地沟油中的甘三酯转化为甲酯和甘油。

The total reaction could be explained by two steps.The first was a fast pre-equilibrium,activation nitrating reagent transferred to the catalyst.

反应共分两部进行：第一步是快速的预平衡步骤，活性硝化剂转移至催化剂上；第二步是缓慢的速率控制步骤，粘结在催化剂上的活性硝化进攻试剂与底物反应生成目标产物。

Step procedure. Firstly, glycidyl rnethacrylate was photo梘rafted onto the surface of PVC without degassing. An activated surface with active epoxy groups was formed. The grafted polymer can also act as the spacer between heparin and PVC; Secondly, heparin is attached to the grafted surface through its functional groups reacted with the epoxy groups.

第一步，通过紫外光接枝反应将甲基丙烯酸缩水甘油酯接枝到PVC材料表面，接枝链作为肝素和聚氯乙烯材料之间连接的间隔基，同时也得到了带有环氧基团的反应性表面；第二步，通过肝素分子所带功能基团与PVC材料接枝表面上的环氧基之间的反应将肝素共价键合到PVC材料表面。

To be there is the first step, and recognizing the presence of the other is the second step.

自己存在是第一步，承认别人的存在是第二步。

When we step to the new world, we are like a child toddling, fall over for the first step. But it doesn't mean to failure as we made the first step after all.

我们迈入新世界时，像一个蹒跚学步的幼儿，刚走第一步就摔倒了，但这不是失败，毕竟我们已经迈出了这一步。

In this "five-step", the evolution of the first step in the series of groups of animals very strange: 14 more haikou insect specimens comparative anatomy studies show that, they not only, and the lack of chordomas in skin, muscle, breathing, circulation, neural organs such as the system with the fundamental difference between the existing chordates, One of the most distinctive is the gills of six foreign composed of respiratory system, and this is the mouth of higher animals in the gills.

在这分&五步走&的演化系列中，&第一步&的动物类群十分奇特：对1400多枚海口虫标本进行比较解剖学研究表明，它们不仅缺少脊索构造，而且在皮肤、肌肉、呼吸、循环、神经等器官系统上与脊索动物存在着根本差别；其中最为独特的是其由6对外鳃组成的呼吸系统，这与较为高等的后口动物的勤鳃迥然有别。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。