Looking round to make sure he was unobserved, he slipped through the door.
他看了看周围,确定没有被人注意,就从那扇门溜走了。
John had been sitting, unobserved, in the darkness.
约翰一直坐在黑暗中,没有被人察觉。
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。