一个守夜人整晚在打篮球，他的篮球技术不断提高。一个值夜班的清洁工虽然比不过他，但是却并没有放弃
A night watchman spends time on a basketball court throwing a ball into the basket. He has become an expert. He shows his abilities to a simple janitor, who also like him, is there all night.
外行？内行？。
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