Scientists have identified the chemicals that lead to the bitter aftertaste of stale bottled beer.

科学家已经鉴定出造成走味的瓶装啤酒带点苦的回味的化学物质。

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He crushed the paper in his hand as though those words contained for him a strange and bitter aftertaste.

他揉着这张纸，仿佛这几个字给了他一种奇苦的余味。

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"It does have a rich umami taste," said chef Chen Judi, "but there's also a bitter aftertaste that people in this region wouldn't like at all."

“它的确很鲜，”厨师陈居地(音)说，“但是还有苦味残留，当地人不会喜欢这个味道的。”

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