[译] 那个高个子在那矮个子脸上重重地打了一拳。
[误] The tall man hit the small man on the face hard with his fist.

[正] The tall man hit the small man in the face hard with his fist.
[注] 表示打在或拍在身体的某一部位时，一般说来，受力部位如果是硬组织，介词就用 on，如果是软组织，介词则用 in. 人们常把脸看作是软组织，所以介词应用 in. 如：The manager patted him on the shoulder. 经理在他肩上轻轻地拍了拍。