■ at

“对…做出回应”常常英文就用介词 at。

• at his suggestion根据他的建议
• at my request应我的请求
• at her signal一看到她发出信号
• at the ringing of the bell应铃声一响
• at the call of the mayor应市长的号召
• at the advice of the doctor遵照医嘱
• At the initiative of Belarus the UN General Assembly adopted on Oct. 19, 2006 a resolution on fighting trafficking in persons.在白俄罗斯的倡议下，联合国大会在 2006 年 10 月 19 日通过了一项打击人口贩卖的决议。
• At her insistence, the matter was dropped.在她的坚持下，该事项撤销了。

但是 advice 和 recommendation 前面也可以用 on 而不用 at（用 on 似乎比较庄重正式）。

• on the doctor's advice遵照医嘱
• Our friends ordered scallops at the recommendation of the waitress.我们的朋友们按照女招待的推荐，点了鲜贝。
• on the recommendation of the European Commission按照欧洲委员会的推荐。

at the opposition of somebody 可以有两个相反的意思。一个是“对某人的反对表示让步、顺从”，另一个是“不顾某人的反对”。前者例如：

• The prince wanted to go the the hills and take up defense position there, but at the opposition of his generals he changed his mind.王子本来想转移到山上去布防，但是经不起将领们的反对，改变了主意。

后者例如：

• The black professor moved his family into a predominately white community at the opposition the white neighbors.黑人教授不顾邻居们的反对，把家搬进了一处以白人为主的社区。