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21. 大约三分之一的美国人在生命的某个阶段报告过膝盖疼痛。

    dà​yuē sān​fēn​zhī​yī de měi​guó​rén zài shēng​mìng de mǒu​gè jiē​duàn bào​gào guo xī​gài téng​tòng.

    About one-third of Americans report knee pain at some point in their life.

    Source: CCMatrix