[I, Tn, Tf, Tw, Tnt only passive 只用於被动语态, Tng, Tni] see and notice (sb/sth); watch carefully 看到, 注意到（某人[某事物]）; 观察; 监视: He observes keenly, but says little. 他观察敏锐, 但是很少说话. * observe the behaviour of birds 观察鸟类的行为 * She observed that he'd left but made no comment. 她看见他离去, 但未置一词. * They observed how the tiny wings were fitted to the body. 他们观看了微型翼的安装情况. * The woman was observed to follow him closely. 有人看到那女子紧跟着他. * The police observed the man entering/enter the bank. 警方监视着那男子进入银行的情况. 
[Tn] (fml 文) (a) obey (rules, laws, etc) 遵守, 奉行（规则﹑ 法令等）: observe the speed limit 遵守速度限制规定 * observe the laws of the land 遵守该国法律. (b) celebrate (festivals, birthdays, anniversaries, etc) 庆祝, 过（节日﹑ 生日﹑ 周年等）: Do they observe Christmas Day in that country? 那个国家的人过圣诞节吗? 
[Tn, Tf] (fml 文) say by way of comment; remark 评说; 评论: He observed that it would probably rain. 他说很可能下雨. * `It may rain,' he observed. ‘可能要下雨, ’他说.> observer n
1 person who observes 观察者; 遵守者; 评论者: an observer of nature 自然界的观察家 * a poor observer of speed restrictions 不遵守速度限制的人.
2 person who attends a conference, lesson, etc to listen and watch but not to take part （会议﹑ 课堂等的）观察员, 旁听者: an observer at a summit conference 高峰会议上的观察员 * send sb along as an observer 派某人作观察员.