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tirelessadj.

英 'taɪəlɪs | 美 'taɪrləs
中文adj. 不知疲倦的;不疲劳的
词根词源
tireless (adj.)1590s, "indefatigable," from tire (v.) + -less. From 1862 in the sense "without a tire," from tire (n.). Related: Tirelessly.
关键词
tireless