1 to watch sb/sth carefully, especially to learn more about him/her/it 观察，观测（尤指为了更好地了解某人或某事物）: We observed the birds throughout the breeding season. 整个繁殖季节我们都在观察那些鸟类。

2 (formal 正式) to see or notice sb/sth 看到；注意到: A man and a woman were observed leaving by the back door. 有人看到有一男一女从后门离开。

3 (formal 正式) to make a comment 发表评论: ‘We're late,’ she observed. “我们迟到了。”她说。

4 (formal 正式) to obey a law, rule, etc 遵守，奉行（法律、规则等）: to observe the speed limit 遵守车速限制