# be up to ##### 词义 - 美：/ bi ʌp tu /； - #词性/v 做某事或参与某事 ##### 例句 - I'll be up to see you tomorrow. - 我明天上来看你。 - It's very quiet upstairs; they must be up to some mischief ! - 楼上很安静。他们一定在搞什么恶作剧。 - "Strange," I thought."They must be up to something!" - “奇怪，”我想。“他们一定在搞什么鬼！”