大概小学4年级的时候,就开始了,让孩子们画个表格,一格一格的填,一看就明白,就是累点。
LZ说的是引入概念。
回答: Even a lot of college students have difficulty to understand
由 sunshinecity
于 2016-10-27 10:43:10
大概小学4年级的时候,就开始了,让孩子们画个表格,一格一格的填,一看就明白,就是累点。
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