Secondary accelerator
[化] 助促進劑
?? 詞語組成解析
secondary
['s?k?nd?ri]
adj. 第二的，中等的;助手，副手;中等教育的;間接的;
n. 副手，代理人;[天]雙星中較小較暗的一個，衛(wèi)星;[語]次重音;
second第二+ary...的→第二的
accelerator
[?k'sel?reit?]
n. 加速器;催速劑;
??? 情景例句
It's a big decision for me, Bill.
對我來說這是個大決定， Bill。
When would you like to return?
你打算什么時候回來？
There were books, clothing and photographs, together with letters which the seaman had once received from his wife.
其中有書箱、衣服、照片以及水手收到的妻子的來信。