那船悬挂着英国旗。

The ship was flying the British flag.

《新英汉大辞典》

这是英国的国旗。

Here's the U.K.'s flag.

youdao

根据报告，在选择目标的，船只上的国旗也在考虑之内，配有英国国旗的船只正在逐渐避免成为海盗的目标。

The national flag of a ship is also taken into account when choosing a target, with British vessels being increasingly avoided, according to the report.

youdao