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The little boy can already do simple problems in addition and subtraction.
这个小不点孩子都已经会做简单的加减法问题了。
youdao
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The danger: students who can not even do simple addition and subtraction.
很危险的是，一些先生甚至连复杂的加减法都不会做。
youdao
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The danger: students who can not even do simple addition and subtraction.
很危险的是，一些先生甚至连复杂的加减法都不会做。
youdao