up to
US /ʌp tə/
UK /ʌp tə/

1.
在干什么, 图谋
doing something, especially something bad
:
•
What are you up to?
你在干什么?
•
I wonder what those kids are up to.
我想知道那些孩子在干什么。
2.
取决于, 由...负责
responsible for something
:
•
It's up to you to decide.
这取决于你来决定。
•
It's up to the manager to approve the request.
这取决于经理批准请求。
3.
4.
胜任, 能够
equal to; capable of
:
•
He's not up to the task.
他无法胜任这项任务。
•
Are you up to a game of chess?
你想玩一盘国际象棋吗?