他感到一种欣快的疼痛。

He felt a sort of delicious pain.

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研究人员专门地集中精力于欣快的、着迷的早期恋爱时期，而不是成熟的浪漫关系。

The researchers specifically focused on the euphoric, obsessive phase of early love rather than more mature romantic relationships.

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一位记者曾写过一篇关于尼泊尔欣快的故事，但结尾用了一个悲伤的句子：“我不知道他们为什么会离开这样一个美丽的地方。”

A reporter once wrote a euphoric story about Nepal, ending with the plaintive line: "I don't know why they would ever want to leave such a beautiful spot."

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