您要查找的是不是：
- We have three periods of chemistry a week. 我们一星期三节化学课。
- The scientist probed into the secrets of chemistry. 这位科学家探索了化学的种种奥秘。
- I can't bear young people casting away their youth. 我无法忍受年轻人虚掷青春。
- Chemistry was her favourite subject at school. 她上学时最喜欢化学。
- That volcano cast forth lots of lava and ashes. 那火山喷了出大量熔岩和灰烬。
- No one can cope with him in Chemistry. 在化学方面，谁也比不上他。
- I am not good at organic chemistry. 我的有机化学学得不好。
- We will do a Chemistry experiment this Friday. 这个周五我们要做化学试验。
- She cast her eyes down to avoid direct eye contact. 她垂下双目以避免对视。
- He used his casting vote to block the motion. 他用他的投票反对动议的通过。
- He cast a furtive glance at her. 他偷偷瞥了她一眼。
- He is cast in his father's mold. 他长得和他父亲一模一样。
- The storm cast the little rowboat on the rocks. 风暴把这条小划艇抛到岩石上。
- He was able to cast off such an uninteresting task. 他终于摆脱了这么一项乏味的工作。
- The earthwork was cast up in three hours. 土方工程在三小时内就完成了。
- He is an authority in the region of chemistry. 他是化学界的权威。
- I have only a rudimentary grasp of chemistry. 我只掌握了化学的初步知识。
- I have lost my interest in chemistry. 我对化学已不感兴趣。
- He was still devoted to the study of chemistry. 他仍专心致力於化学研究。
