substituting
代入
Sub·stit·ute v. t. [imp. & p. p. Substituted p. pr. & vb. n. Substituting ] To put in the place of another person or thing; to exchange.
Some few verses are inserted or substituted in the room of others. --Congreve.
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substituting
n : working as a substitute for someone who is ill or on leave
of absence [syn: subbing]