He apparently was not perturbed by the prospect of a policeman coming to call. [+ by/at]
显然,对警察可能会上门来访,他并没有表现得很不安。
She was really quite perturbed at the prospect.
她对前景十分担心。
英汉双解词典包含141091条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。