tract-trace-retract

retract
They tried to persuade me to retract my words.
他们试图说服我收回我的话。
记忆技巧：re 向后 + tract 拉，拖 → 向后拉 → 退缩；缩进

detract参考：http://www.etthink.com/thread-284244-1-1.html

tract也指管、道
A tract is a system of organs and tubes in an animal's or person's body that has a particular function, especially the function of processing a substance in the body.
Foods are broken down in the digestive tract...
食物在消化道里分解。

trace
It is hard to trace the order of discovery.
很难查出谁是最先发现的人。

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