[误] I saw you stand by the president in the newsreel.
[正] I saw you stand beside the president in the newsreel. 注：stand by someone 的意思是“支持某人”（to support someone）；to stand beside someone 才是“立于某人旁边”（to stand by the side of someone）。但是，如果 stand by 后面的宾语不是人，那倒是可以与 stand beside 互换，表示“在...之旁”，例如：Their house stands by a forest（他们的房子在森林旁边）。除此之外，stand by 还有“袖手旁观”之意，例如：How can you stand by and watch while your allies are attacked？（当你们的盟友受到攻击时，你们怎能袖手旁观呢？）
