strenuous, laborious 
Stamm 
ceppo 
souche 
Cepa strenuous, laborious 11 吃力 [-] chīlì (expend-strength) strenuous, laborious: 在学习上感到 ~ encounter difficulties in their studies || 她以前没有工作经验, 现在工作起 来有些~. She had no previous work experience, so it was difficult for her to get involved in her current job. '| Goethebuch | Vietnamese |
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