however是副词，不能连接两个句子。如，People like to think that being on a diet is healthy,however,there is considerable evidence to the contrary.应该改成 People like to think that being on a diet is healthy；however,there is considerable evidence to the contrary.
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however是副词，不能连接两个句子。如，People like to think that being on a diet is healthy,however,there is considerable evidence to the contrary.应该改成 People like to think that being on a diet is healthy；however,there is considerable evidence to the contrary.