常用字根 –tract = to draw, 拉
1. contract, n. 契约(con-=together, 一份契约将双方拉在一起)
2. attract, v. 吸引(重复字根首字+a, 强调造字法则,吸引就是被拉去了)
3. distract, v. 分心(dis-=apart, 被拉分开)
4. retract, v. 收回(-tract=to draw, 拉回去收回)
5. extract, v. 抽出、拉出(ex-=out, to draw out)
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