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Such a method can replace traditional reaction with phosgene as the carbonylation reagent, involving the toxic reagent and drastic reaction conditions, the new herein studied method is environmentally benignancy and has atom economical selectivity.

它可代替以往的利用光气来给化合物引进一个羰基的方法，具有原子经济反应的高选择性和对环境的友好性，从而越来越受到人们的关注，已成为C〓化学中羰基合成领域的一个重要的研究热点。

Because they have one nitrogen atom with lone pair electrons, benzimidazole compounds are endowed with capability of complex and molecular recognition and they can analogue biological molecule.

苯并咪唑具有一个含孤对电子的氮原子，从而使苯并咪唑类化合物具有很强的配位能力及分子识别能力，可以用于生物分子的模拟。

In order to improve the catalytic activity, A series of bident ligands containing nitrogen atom were prepared by design, such as bipyridine derivatives, phenantroline derivatives, Schiff base of bipyridine etc.

为了提高催化活性，设计合成一系列含氮双齿配体，如联吡啶衍生物、邻菲罗啉衍生物、含吡啶席夫碱等。

A nucleus is about one thousand billionth the size of an atom.

原子核的体积大约是原子的一千兆分之一。

A nucleus is about one billionth the size of an atom.

原子核的大小约为原子的十亿分之一。

A nucleus is about one tho北美nd billionth the size of an atom .

原子核的体积大约是原子的一千兆分之一。

A simpler and effective method to determine the state of atom in element or in binary solid solution is given out.

给出了确定单质或二元固溶体原子状态的简单快捷方法。

Chemical energy is the atom's outer electron changes cause changes in the electron binding energy release of energy.

化学能是原子的外层电子的变动引起电子的结合能变化而放出的能量。

The relative intensities of H atom Blamer lines and Ar-750.4 nm emissions as functions of input power, gas pressure and the position inside the visible MW plasma ball have been investigated.

本实验对氢原子Blamer线系和氩原子750.4 nm 的相对强度与输入的微波功率和气体压力之间的关系进行了讨论。

We clear air ,but we contaminate soul;we dispart atom not to drive our blas;we write many not to learn more;we plan much not to accomplish.

我们清洁了空气，却污染了灵魂；我们分离了原子，却无法驱除我们的偏见；我们写得更多，学到的却更少；我们的计划更多，完成的却更少。

Hanna: That's over now, isn't it?

都结束了，对吗

You must be ill. You look so pale.

你一定是病了，你的脸色苍白。