这个岛国在外交上接受邻国的宗主权，但保留内部自治权。

The island nation accepted the neighboring country's ___suzerainty over its foreign affairs while retaining internal autonomy.

在19世纪，英国对尼泊尔行使宗主权，控制其外交事务。

In the 19th century, Britain exercised ___suzerainty over Nepal, controlling its foreign affairs.