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请问一下三个例子为什么不满足必要条件?(meeting necessary conditions)详细求解:

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请问一下三个例子为什么不满足必要条件?(meeting necessary conditions)详细求解:
1.One way of becoming rich is by wining the lottery.In order to win the lottery you have to get a lottery ticket for the draw.Chen has a lottery ticket so he can make a lot of money.
2、Birds have wings.This creature has wings.The creature is a bird.
3、To progress to Year 2 you must sit the examination.You sat the examination so you can progress.
请问一下三个例子为什么不满足必要条件?(meeting necessary conditions)详细求解:
嗨,哥们,这个很简单,你先用谷歌翻译成中文,然后你看的清楚了,就知道为什么了.
我这里就分析下第二个例子,因为我懒得看谷歌翻译了,挑一个短一点的我先解答下,给你点思路.
你看:小鸟带着环儿,那个生物带了环儿,所以那生物是鸟儿.
关键在于:其他的生物比如猴子带着环儿呢?
所以那生物还可能是猴子