digression

n.

离题，岔开；

复数：digressions

1. Here a short digression becomes necessary.
   这里有必要加一点题外的话。
2. After this digression we return now to our original problem.
   在这一段插话以后，现在回到原来的问题。
3. Now let's return from this digression to our subject.
   现在咱们言归正传。
4. The wreck was caused by the digression of the two ships.
   这次遇难事件是由两只轮船的脱离航道引起的。

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