For most individuals, mastery of the subject matter will require a substantial commitment of time and effort.

对大多数人来说，掌握科目的主要内容还是需要投入大量时间和精力的。

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You might be keen to take a sabbatical or make a substantial commitment of time or energy as a volunteer. You might want to change to a new career that you'd love - but that would bring in less money.

你可能想要一个休假或者自愿做出时间上或精力上的重大牺牲。

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Adding dynamic UI features requires anything from a few minutes' work to a substantial time commitment.

添加动态特性需要从几分钟的工作到大量时间的花费不等。

youdao

But I think there are substantial proportion of faculty who really do have a commitment defined in different ways.

但我认为确实相当一部分教职工,虽然有不同的理解，但能做到尽职尽责。

普林斯顿公开课 - 人性课程节选

That's why, up front, I've said this is going to take sustained, substantial commitment.

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Because players don't become eligible for free agency until after six years, teams can get great value without making any substantial commitment to them.

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Obtaining support for a substantial troop commitment is more difficult when voters are concerned about their economic security.

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