I'm tied up at the moment.
我这会儿正忙呢。
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今天的几个句子是有关工作繁忙的：
1.I can't leave this job at the moment. 我现在离不开。
2.It's been a long day. 今天忙了一天。
3.I've got so much to do. 我有很多事要做。
4.I'm too busy to bother with such details. 我没空理会这些细节问题。