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The organoboron compounds in this paper are based on triarylboranes, boronic acids and boronic esters. The structure-property relationship and sensing mechanism are elucidated. Organoboron compounds as Lewis acid can be used as fluoride probe with high sensitivity and selectivity because they have a unique LUMO in which the π-conjugation is divergently extended through the vacant p-orbital of the boron atom. The complexation of the boron π-electron systems with fluoride ion would interrupt the π-conjugation extended through the boron atom, causing the change of photophysical properties.

介绍了基于三芳基硼化合物、硼酸和硼酸酯的有机硼化合物在氟离子检测中的应用，评述了这些化合物的结构和检测性能之间的关系，讨论了检测机理，即有机硼化合物中硼原子空的p轨道使其作为路易斯酸能够选择性地结合氟离子，硼原子与氟离子的结合破坏了硼中心与芳香取代基的p-π共轭，引起有机硼化合物光物理性质的变化，从而实现对氟离子的高选择性检测。

Divide the animals for experiment into groups randomly, named normal group,model group,vacant control group, xiaomin granule (low-and high-dose)groups, chlorpheniramine group, and experimentize the anminals with homologous medication respectively.

方法用卵白蛋白与ai悬液的混合液致敏和诱发，制成ⅰ型超敏反应动物模型。将实验动物随机分组，即正常组、模型组、消敏颗粒低、高剂量组、扑尔敏组，分别给予相应的药物进行动物实验。

Because potential users have few expectations of the contents of an explorational kiosk, it becomes difficult for them to justify waiting in line to use one. It is safe to assume that most people will only approach an explorational kiosk when it is vacant.

由于潜在使用者对于探索型信息亭的内容有较少期待，因此他们没有足够的动机排队等待使用，因此可以认为多数人只有在探索型信息亭空着时才会走上前去。

In fact, over 20 opposition chairs in the 225-seat chamber were frostily vacant.

理论上说，这个消息应该是向座无虚席的国会宣布的，但事实上，在225个会议席位中，空出了20个反对派的席位。

Families grew their own food on what land they had. Other people gardened in vacant lots, on rooftops, and in city parks.

很多家庭在自有的土地上种植粮食，也有些人在闲置的小块土地上、屋顶上和城市公园里种。

The men pulled out their watches; late-comers sprang from their conveyances before these had fairly drawn up; the groups left the sidewalk, where the passers-by were crossing the now-vacant space of gaslit pavement, craning their necks, as they did so, in order to get a peep into the theater.

男人们掏出表来看，迟到的观众还没等车子停稳就跳下来，观众三五成群地离开人行道，过路人漫不经心地穿过煤气灯光下的一片空荡荡路面，伸长脖子朝剧院里张望。

It seems that there are much more un-natural likes in my heart in these ten days. Staring at the sky with a little vacant and inexplainable and depressed mood, suddenly the depressing sky rains, I am so startled by it, doesn't it mean that this is the "tear-likes"?

好像十几天的非正常生活让我的心里多了许许多多的非正常的喜欢，以有点空洞的无法解释的深沉心情望着天空，深沉天空忽然下起雨来了，我大惊，难道这是泪的喜欢？

And they produce a host of books written by Musaeus and Orpheus , who were children of the Moon and the Muses--that is what they say-- according to which they perform their ritual, and persuade not only individuals, but whole cities, that expiations and atonements for sin may be made by sacrifices and amusements which fill a vacant hour, and are equally at the service of the living and the dead; the latter sort they call mysteries, and they redeem us from the pains of hell, but if we neglect them no one knows what awaits us.

人们还可以从月亮女神和缪斯女神的孩子们——默塞俄斯和俄尔甫斯的一系列著作中得到相同的印证——也就是说——依据他们在书中描写的古老风俗礼仪，当时的礼制不仅规劝个人而且号召全城老少，都应该以贡献牺牲和歌娱欢宴的方式替原罪去抵罪和赎罪以消磨时光，并且对活着的人和死去的人要一视同仁；歌娱欢宴方面的活动后来就形成了祓除祭祀之类的神秘宗教，而正是这些神秘宗教救我们逃离苦海，谁胆敢轻侮它们必会为自己招来无妄之灾。

Pinned with a thumb-tack to a vacant part of the canvas was a piece of paper now badly curled up -- probably, I thought, a photograph from which Pickman meant to paint a background as hideous as the nightmare it was to enhance.

平静下来之后，我走近了几步，发现画布空白的地方贴了张照片，皱的一塌糊涂，大概是张用做参考的风景照，想必也怪恐怖的。

Those outstanding narrative poets pursue not only concrete "polt" and "dramatis personae",but also vacant and abstract "imagoes" which abound in symbolic meaning.

当时的优秀诗人既追求具体可感的坚实的&事象&和&形象&，更注重营造空灵、超越而富于象征性的&意象&。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了