Mobile sources
[经] 机动的来源
🧩 词语组成解析
n. 输入源；发起者；来源（source的复数）
🗣️ 情景例句
Would you please repeat your offer again?
能否再说一遍您的优惠？
So he keeps on studying after his English classes in order to prepare for life in America.
所以他在英语课下课后还继续学习，为以后在美国生活做准备。
Don't speak to me now, Kate. I must go. I'm late !
凯特，不要和我说了，我必须走了，要迟到了。