こつこつ働く， コツコツ働く， こつこつはたらく， コツコツはたらく
1. to work hard, to toil, to moil, to keep one's nose to the grindstone, to slug away
努力工作，辛勤劳作，埋头苦干，脚踏实地，兢兢业业
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@ 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