常用字首 per-=through
1. perspect: v. 透视(-spect=to look, to look through能够看穿了,所以是透视)
2. perspire: v. 流汗(-spire=to breath, to breath through, 流汗是一种皮肤呼吸的方式)
3. permit: v. 允许(-mit=to send, to send through, 能送过去,就是得到允许了)
4. persist: v. 持续(-sist=to stand, to stand through, 站在那儿穿过一段时间,所以是持续)
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