常用字根 –tain=to take
1.attain=at-+-tain, v. 获得(重复字根字首+a, 强调造字法)
2.contain=con-+-tain, v. 包含(to take together,都拿在一起)
3.detain=de-+-tain, v. 拘留(to take apart, 带到一边分开,拘留起来)
4.retain=re-+-tain, v. 保留(to take back, 拿回来保留)
5.maintain=main-+-tain, v. 维持(一直拿着)
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