Follow that woman and keep her in sight all the time.
要跟着那个女人,一直盯着她。
The aircraft climbed so rapidly that it was difficult to keep it in sight.
飞机很快爬高,肉眼难以盯住。
keep sth in sightThat is irrelevant; we must keep the main purpose of this meeting in sight.
那毫不相干,我们要牢牢记住这次会议的主要目的。