n. 1.代，代用，代替，更替，置换。 2.【化学】取代；【数学】代换；代入；【法律】预定继承人；【语法】词的代用。 adj. -al ,-ary adj.
the act of putting one thing or person in the place of another: "he sent Smith in for Jones but the substitution came too late to help" 同义词：exchange, commutation,
an event in which one thing is substituted for another; "the replacement of lost blood by a transfusion of donor blood" 同义词：permutation, transposition, replacement, switch,
例句与用法
1.
The overall reaction is one of substitutions . 总反应是取代反应中的一种。
2.
They allow no substitutions on the club luncheon . 客饭固定的午餐不能换菜。
3.
I have made the substitutions required in this book . 我在本书中已应需要作了改换。
4.
The procedure for solving the eqs is called back substitution . 解方程组的这一步骤叫回代。
5.
Substitution : player no. 4 for no. 3 . 换人：
6.
For the moment, she could scarcely forgive the substitution . 这会儿，她没法子宽恕这种更替。
7.
Amines can engage in nucleophile substitution reaction with alky . 胺能参加与卤代烷的亲核取代反应。
8.
Substitution , no.3 for no.4 . 换人：
9.
Bridged bicyclooctanes gave no significant bridgehead substitution . 桥二环辛烷不给出有意义的桥头取代。
10.
It was merely the substitution of one piece of nonsense for another . 这不过是用一个谎话来代替另一个谎话。
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