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One's own free will ————— 主动，自愿
英文释义
Voluntarily; without coercion.
例句
My usually lazy teenage son recently surprised me by starting to study vigorously at school of his own free will.
我儿子10多岁，一直比较懒，可不久前，他开始主动刻苦学习，让我感到意外。
adv. 自动地，以自由意志
