原因有以下几点用英语：
1、There are several reasons why.
2、The following are a few reasons why.
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3、Several of the reasons are as follows.
相关介绍重点单词：reason
n.原因;理由;解释;正当理由;道理;情理;思考力;理解力;理性
v.推理;推论;推断;思考;理解
第三人称单数： reasons复数： reasons现在分词： reasoning过去式： reasoned过去分词： reasoned
例句：
For some peculiar reason, she refused to come inside.
出于某种奇怪的原因，她拒绝到里面来。
The reason why the injection needs repeating every year is that the virus changes.
每年需要重新注射的原因是这病毒经常变化。
Then, for no apparent reason, the train suddenly stopped.
接着，不知什么原因，火车突然停了下来。
He wants to keep them all in his office for reasons best known to himself.
他想把他们都留在他的办公室里，原因只有他自己知道。
