Substitutes replace main players during a break in play.

替补在暂停时替换场上主力。

youdao

When a user clicks a thumbnail, have the larger version of the thumbnail (not the thumbnail itself) replace the current main photo.

当用户点击缩略图的时候，要用较大的缩略图(不是原缩略图)替代当前的主图。

youdao

One of the main biofuels is bioethanol, which could supplement or even replace gasoline as a transportation fuel.

主要生物燃料之一就是生物乙醇，可以做为补充甚至直接替代汽油作为运输燃料。

youdao

In April, the government will implement a system that would replace the main means-tested benefits-- such as income and housing support -- with a single payment.

CNN: UK's poorest banking on food donations as austerity bites

The central idea is that when reading a story, you replace yourself as the main character.

FORBES: New Study Says We Take on the Traits of Our Favorite Fictional Characters

Syriza, which broke through to 17% in the May election, looks set to replace Pasok as the main opposition party.

BBC: Why young rural Greeks are set to embrace Syriza