This happened once when I was in the mall with my best friend, and met up with another friend.
有一次，我和最要好的朋友购物时，碰到另一个朋友，就发生了这种事情。
What happened to Australia's megafauna, the giant animals that once existed across this enormous continent?
曾经生活在澳大利亚这片广袤大陆上的巨型动物经历了什么？
If the doublecross happened only once, you might decide to continue the friendship, but let this guy know that his behavior is unacceptable.
如果出卖朋友行为只发生了一次，你可以决定继续友谊，但是要让这个家伙知道这种行为不能接受。
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