您要查找的是不是：
- A little crack detracts from the value of the vase. 小小的裂痕减损那个花瓶的价值。
- The marchers jumped off at the crack of dawn. 行军队伍在破晓时出发了。
- The riot police started to crack down on them. 防暴警察开始对他们采取镇压行动。
- You'll crack up if you go on working so hard. 你继续这样拚命干下去，身体会吃不消的。
- Have another crack at solving this puzzle. 再试一试把这个难题解决了吧。
- Oxygen enters into many compound bodies. 氧是许多化合物的组成部分。
- She made a crack about his fatness. 她取笑他肥胖。
- There is a crack in this window. 这扇窗户上有个裂纹。
- The results show that the sequence of sulfur-containing compounds cracking from difficulty to ease is thiophene, 2-methylthiophene, 2,5-dimethylthiophene. 结果表明，噻吩类硫化物的裂化难易顺序为噻吩<2-甲基噻吩<2，5-二甲基噻吩。
- She got up at the crack of dawn. 天刚亮她便起床了。
- Mary found knitting a hard nut to crack. 玛丽发现编织并非易事。
- He was the tough guy, the big shot, who gave orders with the crack of a whip. 他是个威风凛凛发号施令的强悍的家伙，是个大人物。
- Air is a mixture, not a compound of gases. 空气是气体的混合物，不是化合物。
- Rose is a plant with compound leaves. 玫瑰是复叶植物。
- "Broad-shouldered" is a compound word. "Broad-shouldered"是个复合字。
- I'd do anything to see you crack a smile. 为了博得你的一笑，我情愿做任何事。
- Common salt is a compound of sodium and chlorine. 食盐是钠和氯的化合物。
- Her foot wedged in the narrow crack. 她的脚卡在那狭缝里了。
- Close examination revealed a crack in the vase. 花瓶经仔细检查发现有裂缝。
- It was then a hard nut to crack. 在那时是一桩很棘手的事。
