1. Age has left its traces on her face.
   岁月在她脸上留下了痕迹。
2. They feared some undetected trace of poison.
   他们担心一些未被识破的投毒痕迹。
3. We have lost all trace of him.
   我们找不到他的踪迹。
4. There are traces of poison in the fish.
   这种鱼体内有微量的毒素。
5. His family traces back to the Norman Conquest.
   他的家世可追溯到诺曼人征服英国的时代。
6. The bed bore traces of having been slept in.
   那张床上留有被人睡过的痕迹。
7. There was not a trace of cynicism in his voice.
   他的语气里没有一丝挖苦。
8. The custom traces to the time of the Warring States.
   这个风俗可上溯到战国时期。
9. Bob's book traces his flying career with the RAF.
   鲍勃的书追溯了他在英国皇家空军的飞行生涯。
10. It leaves no trace after fire extinguishing.It replaces for alkylogen annihilator.
    灭火后不留痕迹，是取代卤代烷灭火器的替代品。
11. Kelp is rich in vitamins and trace elements.
    大型褐藻富含维他命和微量元素。
12. We traced the trouble to a faulty transformer.
    我们查出故障出在一个有毛病的变压器上。
13. He traced the words with a shaking hand.
    他用颤抖的手写下那些字。
14. Trace an analogy between pastoral poetry and landscape painting.
    找出田园诗和风景画之间的相似之处。
15. The names were traced out in stark black print.
    这些名字是用醒目的黑体字印出的。
16. All trace of his working-class background was deliberately obscured.
    他工人阶级出身的所有痕迹都给有意地隐藏起来了。
17. The family has traced its ancestry to the Norman invaders.
    这个家族将自己的世系追溯到诺曼征服者。
18. The seeds contain hydrocyanic acid and a trace of a toxalbumin.
    种子包含氢氰酸和微量的毒白蛋白。
19. They traced the criminal to a house in the city.
    他们追踪罪犯到了城里的一座房子里。
20. They could not trace him.
    他们找不到他。

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