twice
adv. 两次；两倍，强（或好、难）的多
例句
She's backpedalled twice already.
她已经两次改变主意了。
《柯林斯英汉双解大词典》
I go swimming twice a week.
我每星期游泳两次。
《牛津词典》
I visited once or twice.
我参观过一两次。
