This is called mittelschmerz from the German words for "middle" and "pain" because it occurs mid-cycle.

“经期间痛”这个词来自于德语中的“中间”和“疼痛”两个词，由于它发生在两次月经之间。

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Studies show your pain tolerance is at its peak in the middle of the day.

研究表明人体在中午时间段对疼痛的忍耐能力最高。

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But just in the middle of the river he felt a terrible pain and realised that, after all, the scorpion had stung him.

可就在河中央，青蛙感到一阵钻心的疼痛，意识到蝎子到底还是蜇了他。

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Bill Clinton sold himself as a New Democrat who felt Middle America's pain.

ECONOMIST: Lexington

Are they seriously prepared to inflict more pain on the middle class because they refuse to ask anything more of those at the very top?

WHITEHOUSE: WEEKLY ADDRESS: Congress Must Act Now to Stop the Sequester

On November 16th several hundred ordinary, middle-aged Australians, with pain in their faces and tears in their eyes, packed the hall to witness a ceremony devoted to them.

ECONOMIST: Kevin Rudd says sorry for a past evil