be up to的用法和样例:
例句
- I feel a bit out of form today; I'm afraid my tennis won't be up to your standard.
我今天略感不适,恐怕我的网球水平达不到你的标准。 - The little girl ran a temperature and had to be up to bed.
那个小女孩发烧了,得让她上床躺着。 - Where's that naughty child now? I'm sure he'll be up to no good wherever he is.
那调皮孩子哪儿去了? 我看,他到哪儿也做不出好事来。