[译] 警察抓住了小偷的手。
[误] The policeman caught the thief by hand.

[正] The policeman caught the thief by the hand.
[注] by hand 与 by the hand 虽只有相差一个定冠词，但表示的意思不同。by hand 指“手工做的”；by the hand 则表示“在手这个部位”。而且句中的 by the hand 也不能用 by his hand 来取代。