英语选择 They are good friends._ is no wonder that they know each other

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It's no wonder是一个固定句型：译为：难怪,毫不奇怪,足为奇
例如：
It is no wonder that the children love to visit the farm.
孩子们喜欢去农场玩是不足为怪的.
It is no wonder at all that Singaporeans are poor speakers or writers of Chinese as compared with other peoples.
新加坡人的中文的程度当然会不如人了,不足为怪
另外It is a wonder that he remained alive after dropping from the roof of a ten-storied building.
他从一幢十层楼房子的屋顶上摔下来,但仍然活着,真是奇迹.