substitutes例句
Industry has been working at developing harmless
substitutes for these gases.
该行业一直在努力开发一些可以替代这些气体的无害物质。
The extra players, or
substitutes, wait until they are called.
额外的运动员或是预备去替换的人没被召唤时在里面等着.
He
substitutes as our teacher of English.
他代任我们的英语教师.