Energy usage devoted to active learning accounts for a big part of it.

专门用于主动学习的能量使用占了能量总数的很大一部分。

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In early period, there were no half-measures: usage was either right or wrong, and it was the task of the grammarian not simply to record alternatives, but to pronounce judgement upon them.

在早期，没有折中办法：（语法）用法不是对就是错，并且语法学家的任务不是简单地记录备选词，而是对它们作出判断。

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It involves changing product quality, features, or style to attract new users or more usage from present users.

这涉及改变产品质量、特性或风格，以吸引新用户，或提升现有用户的使用率。

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The farmers themselves pay to keep it running. Their new irrigation method has cut water usage by half.

VOA: standard.2009.12.10

Rather, they see their task as managing spectrum so that it usage remains as efficient as technology allows.

ECONOMIST: Spectrum policy

It divides usage models into more or less "watch video, " "watch HD video, " "edit HD video" and "play HD games, " and it involves training sales people to derive a buyer's usage level with an appropriate question (what do you want to do with it?) and steer him or her toward a specific system.

FORBES: Sometimes all it takes is common sense.

Instead, it manages usage rights and pays photographers royalties of up to 40% of the take.

FORBES: Snap Decisions