别抱怨不好的事，要对好的事心存感恩。Instead of complaining about what's wrong, be grateful for what's right.“我想发份电报。”——“好的，发给谁？”"I want to send a telegram." — "Fine, to whom?"她会好的。她一直都很强壮。She's going to be fine. She always ...
The axioms adopted by Euelid mere supposed to be self - evident truths.欧几里德用的公理都应看作是不证自明的真理.Further on, we can specify an algebra that consists of axioms for commutativity, distributivity, associativity, etc.进一步的, 我们可以定义...