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through与by的区别

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through与by的区别
Tom's forgiveness went a long way in helping my family ____ that difficult time.
请仔细讲一下 by 与through 的区别 然后填空
through与by的区别
through是从物体的上方通过
by 是从物体的旁边通过
还有cross是从物体的中间通过
through 是通过某种途径
He bought the antique vase through a dealer.
他通过一个商人买到这只古花瓶
He became rich through hard work.
他靠努力工作而致富.
through表示“以;通过;经由”.如:
by 是通过某种方法
1.表示以一般的方法或方式.如:
No one in those days could live by writing poems.
(2)表示传达、传递的方式或煤介.如:
How did you send the letter, by airmail or by ordinary mail?
I came back by bus.
我是乘公共汽车回来的.