Allyloxy
烯丙氧基
??? 情景例句
Weren't they going to be here this morning?
他們不是今天早上要來這兒嗎？
Children are the parents's riches.
子女是父母之財富。
They ask question like Li Lei, is it in your right hand?
“李磊，橡皮擦在你右手里嗎？”