We decided, more or less on a whim, to sail to Morocco.

我们多少有点心血来潮，决定航海去摩洛哥。

The premium can increase at the whim of the insurers. [+ of]

保险公司可以随时提高保费。

Lately, the president has been sacking and picking new ministers at whim.

最近，总统一时兴起频频解雇旧部长，选任新部长。