| 释义 |
on INVOLVEMENTHBn, $B:nprepused to show when someone is involved or taking part in something在从事…中I'm working on a new book.我正在写一本新书。She's out on a job for me, but she'll be back soon.她正在外面替我办事，但是她很快就会回来。In the last lesson we were on the causes of the First World War, weren't we?上一堂课我们上的是第一次世界大战的起因，是吗？"Where had we got up to?""We were on page 42."“我们上到哪儿了？”“我们上到第42页。”
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