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1·Don't digress from the subject when lecturing.

讲课时不要扯到枝节上。

2·I seem to digress from the subject in this essay writing.

这次作文我好像写跑题了。

3·His essay digress from the main subject.

他的文章离开主题。

4·Don't digress (from the subject) when lecturing.

讲课时不要岔开(主题)。