improve on/upon 改进，超过
inform of/about 通知，告诉
inform against/on 告发，检举
inquire of/about 询问，打听，调查
insist on/upon 坚决要求，坚持
interfere in/with 干涉，介入；妨碍，干扰
involve in 卷入，陷入；牵涉，包含
knock down 击倒，撞倒
knock out 击倒，击昏
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