替补的的英文：
suppletive

Clive Walker came on as a sub and starred.
克里夫-沃克替补上场，大放异彩。

If one of the contestants doesn't come,I will be the alternate.
如果有一个参赛选手不来，那么我就替补上场。

Alternative characterization of concave and convex functions which is sometimes useful
对于凹函数和凸函数还有一个替补的表征，有时它是有用的。