B1 used to say that something is less than or equal to but not more than a stated value, number, or level接近于;至多
B1 also up until until直到
B1 to be the responsibility of someone是(某人)的职责
B1 to be doing something, often something bad or illegal, usually secretly(通常指偷偷地)正在做(常指坏事或不法之事)
See also: up to (doing) sth
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