... mathematical structure(system)：数学结构（系统） closed with respect to：对…是封闭的 binary operation：二元运算 unary operation：一元运算 ...
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There have been problems, obviously, with respect to sexual abuse or assault directed against women, where institutions sort of closed ranks instead of getting on top of it right away.
WHITEHOUSE: President Obama Holds a Press Conference at the APEC Summit
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