In t he end,we defined the same relation on the direct product of two commutative ca ncellable semigroups,then proved this relatio...是什么意思_In t he end,we defined the same relation on the direct product of two commutative ca ncellable semigroups,then proved this relatio...在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句