This event marked the United States' official entry in World War Two.

这一事件标志着美国正式加入第二次世界大战。

Now, he had to present them with a picture to mark his entry.

现在他得交给他们一幅画以标志着他的加入。

The launch marked the company's entry into competition with SpaceX to provide service for the American space agency NASA.

这次发射标志着该公司开始与 SpaceX 竞争，为美国国家航空航天局（NASA）提供服务。