コツコツ， こつこつ

1. steadily, unflaggingly, untiringly, laboriously, diligently 2. knocking, tapping, clicking, drumming

稳步地，不懈地，不知疲倦地，辛勤地，勤勉地；敲击、轻敲、咔嗒声、击鼓声

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