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。
"You never sing enough," she added. Her smile to me was effortful and pinched.
“你从来就不多唱几句，”她又说，冲我微笑一下，显得牵强而痛苦。
Simple in theory, effortful in practice, and the most valuable, meaningful commodity in the world.
理论很简单，实践起来却需要付出努力，但你所收获的成果，也是这个世界上最有价值、最有意义的。
Simple in theory, effortful in practice, and the most valuable, meaningful commodity in the world.
理论很简单，实践起来却需要付出努力，但你所收获的成果，也是这个世界上最有价值、最有意义的。
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