There are some footballs under the bed.
床底下有几颗足球。
These students are under seventeen years old.
这些学生们不到十七岁。
until 直到,在...以前,
Please wait for us until we come back.
请等着我们回来。
It was not until last week that I handed in mathematics paper.
直到上周,我才交了数学论文。
up 在...上面,在...上。
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