17 - affect, effect etc.
17.1 affect ( v. ) 影響, 感染(疾病)
17.2 effect ( n. ) 效果, 影響 /
effectiveness ( n. ) 有效性
I think I am suffering from the effects of too little sleep.
17.3 effective ( adj. ) 有效的
Mr Ho is a very effective teacher.
17.4 effectively ( adv. )
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