n.離題；脫軌
Here a short digression becomes necessary. 這里有必要加一點(diǎn)題外的話。
Now let's return from this digression to our subject. 現(xiàn)在咱們言歸正傳。
The wreck was caused by the digression of the two ships. 這次遇難事件是由兩只輪船的脫離航道引起的。
