effortful study
需要努力的学习
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This structured knowledge is built by years of effortful study.
结构化知识非历经数年苦功不可得。
youdao
It takes about ten years of effortful study to become an expert
成为一名专家=十年的时间+刻苦学习
To do this years of effortful study, motivation is a very important factor
长达数年的刻苦学习的关键：激励！
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