每天练习半小时
Practice for half an hour every day
以上为机器翻译结果，长、整句建议使用 人工翻译 。
因此有必要每天写它，每天说它，每天至少听半小时，和每天多做有关它的练习。
It's necessary to write it every day, speak it every day, listen it less than a half hour in a day, and do more exercise about it.
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大量证据表明优秀的执行者每天的练习不超过四个半小时。
The evidence is equally strong that great performers practice no more than 4? Hours a day.
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