I buttoned up my coat; it was chilly.

我扣上大衣；天冷嗖嗖的。

The top can be worn buttoned up or open over a T-shirt.

这件上衣可以系上扣子或不系扣子套在T恤衫的外面穿。

She buttoned up her blouse .

她将她的连衣裙扣好。

I just buttoned up and listened.

我就那么一声不吭的听着。

I've never met anyone so buttoned up.

我从来没有见到过这样不爱讲话的人。