In there compounds, the cyclopentadiene ring has only four hydrogens.在这些化合物里, 环戊二烯环只有4个氢.Those that are aligned perpendicular to the plane are called axial hydrogens.与平面垂直定向的氢叫做直立氢.A methane molecule is composed of one c...
...the first day of the school holidays.学校放假的第一天I spent much of what I laughingly call 'the holidays' working through 621 pages of typescript...我把我戏称为“假日”的大部分时间都花在那621页的打字稿上了。All his poor kinfolks came to spend...
很多人认为是他的腼腆和缺乏安全感拖了他的后腿。Many believe it was his shyness and insecurity which let him down.博比望着她腼腆地咧嘴一笑。Bobby looked at her with a sheepish grin.“你好，利兹，”她腼腆地说。"Hi, Liz," she said shyly....
A clerk simply verifies that the payment and invoice amount match.职员只是核实付款和发票上的数额是否一致。The plate and stone tablet found at each of the ruins verifies this.废墟中发现的盘子和石碑证实了这点.She edits the file and verifies that her change i...