[译] 那名警察正在市中心指挥交通。
[误] The policeman is commanding traffic in the centre of the city.

[正] The policeman is directing traffic in the centre of the city.
[注] 动词 direct 与 command 是同义词；command 意为“指挥”、“命令”，主要指“指挥”部下，进行某种军事行动。如：The general commanded his men to attack the city. 那位将军指挥部下攻打那座城市。/The officer commanded his men to fire. 军官命令部下开火。但是“指挥”交通须用 direct，又如：The policeman directed to stop. 警察指挥交通停下。direct 也可表示军事上的“指挥”。如：The officer directed his men to advance slowly. 军官指挥部下慢速前进。