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In this dissertation, the efforts were focused on design and synthesis of chiral tmsymmetrical urea, cholic acid and heteroaromatic molecular tweezers and their molecular recognition as well as enantioselective recognition. A series of useful and creative results have been obtained.Three new types of chiral molecular tweezers containing unsymmetrically disubstituted urea unit, four new types of chiral molecular tweezers based on steroid cholic acid and one type of heteroaromatic molecular tweezers involving multiple hydrogen-bonding site have been designed and synthesized.

本文致力于新型手性不对称脲、胆甾和芳杂环类分子钳受体的设计合成及其对阴离子、中性分子和手性分子的识别及对映选择性识别性能研究，取得了一系列具有重要学术意义与应用前景的创新性结果。

Get a T-shirt with your site URL printed on it, hang out at local festivals with that shirt on, and look for the news van.

把你的网站告诉地球上的小学生，让他们为你做一个底部有你的网站链接的。

Get a T-shirt with your site URL printed on it, hang out at local festivals with that shirt on, and look for the news van.

获得T恤，您网站的网址印上，挂出在当地的节日与衬衫上，并寻找新闻面包车。

A video clip of Zhang Bin's wife Hu Ziwei commandeering a microphone at a China Central Television presentation of its coverage plans was easily one of the most viewed items on Chinese video site tudou.com on Monday.

周一，一段关于张斌妻子胡紫薇在中央电视台的新闻发布会上强占一个麦克风的视频剪辑很快成为tudou.com网站中国视频中最热门的一条。

A video clip of Zhang Bin's wife Hu Ziwei commandeering a microphone at a China Central Television presentation of its coverage plans was easily one of the most viewed items on Chinese video site tudou.com on Monday.

一个剪辑过的视频星期一在土豆网上发布，成为当天最为关注的对象。视频的内容是张斌的妻子胡紫薇在中国中央电视台奥运频道新闻发布会上说的话。

A video clip of Zhang Bin's wife Hu Ziwei commandeering a microphone at a China Central Television presentation of its coverage plans was easily one of the most viewed items on Chinese video site tudou.com on Monday.

星期一。张斌妻子胡紫薇的一个在中央电视台讲话的视频片段很容易的能够在中国的一个视频网站，土豆网上查看到。

A video clip of Zhang Bin's wife Hu Ziwei commandeering a microphone at a China Central Television presentation of its coverage plans was easily one of the most viewed items on Chinese video site tudou.com on Monday.

张斌的妻子胡紫薇在央视的新闻报道计划发布会上霸占麦克风的一段视频在周一很快就成为中国视频网站土豆网上观看率最高的视频片段之一。

A video clip of Zhang Bin's wife Hu Ziwei commandeering a microphone at a China Central Television presentation of its coverage plans was easily one of the most viewed items on Chinese video site tudou.com on Monday.

张斌的妻子胡紫葳在央视的新闻发布会上强占麦克风的一段视频开始成为周一土豆视频上点击率最高的视频片段之一。

A video clip of Zhang Bin's wife Hu Ziwei commandeering a microphone at a China Central Television presentation of its coverage plans was easily one of the most viewed items on Chinese video site tudou.com on Monday.

周一，一段关于张斌妻子胡紫薇在中央电视台的计划发布会上抢过话筒的是视频剪辑一举成为了中国土豆视频网上的最高点击视频之一。

A video clip of Zhang Bin's wife Hu Ziwei commandeering a microphone at a China Central Television presentation of its coverage plans was easily one of the most viewed items on Chinese video site tudou.com on Monday.

周一，一段有关张斌的妻子胡紫薇在中国中央电视台奥运相关计划的陈述会上抢过话筒的录像片段成为中国录像网站&土豆网&上点击率最高的项目。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。