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catch on<-->catch up with
catch up 追上,赶上 You just go ahead and I'll catch up later. 你先走一步,我随后赶来。 You'd better drive faster, because the others are catching up quickly. 你最好快点开,别人很快就会赶上来。 I'm badly behind with my work and I am making great efforts to catch up. 我的工作太落后了,我正在努力赶上去。
catch on<-->catch up with
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