在‘白宫’代表美国总统时，‘白宫’是一个转喻词。

When 'the White House' refers to the US president, it is a ___metonym.

在这首诗中，'王冠'作为权力的借代手法使用得非常巧妙。

In this poem, 'the crown' is used as a ___metonym for power very skillfully.