It was a black flag.

原来是一面黑旗。

Ship sailed under false colours: it flew the American flag until it got near, then raised the black flag .

海盗船挂着美国国旗航行，直到驶近才升起黑旗。

It was a pirate ship with a black flag and a crew of armed pirates.

那是一艘海盗船，船上挂着一面黑旗，还有一群全副武装的海盗。

A pirate ship was always decorated with a black flag bearing a white skull and crossbones.

海盗船通常悬挂一面白色的骷髅旗.