usage time

基本解释

If you really need more usage time, buy an extended-capacity battery and use it normally.
如果你确实需要更长的使用时间，去买一块超容量的电池并正常使用吧。
This offered the highest usage time in the short-term, but was damaging the battery over the course of ownership.
这个能在短期内提供最长的使用时间，但是会在充电过程中减少电池的寿命。
Many 14-inch notebook, you may use 2 and 4 stringsof 8-cell hybrid mode, the voltage will still be 14.4V, capacity is doubled to4400mAh, to ensure a longer usage time.
而很多14寸以上笔记本，则可能采用2并4串的8芯混联方式，电压依然为14.4V，容量翻倍达到4400mAh，保证更长的使用时间。

The antiquity of a law alone is no justification for its usage. Aristotle seems to reject you might say Burkean conservatism long before the time.
法律的古老性不能作为其用法的借口,亚里士多德似乎事先拒绝,你可能会说柏克式的保守主义,古老与传统并不能。
耶鲁公开课 - 政治哲学导论课程节选

WebMd now gives phone usage time advice!
FORBES: After I Dumped My Smartphone - 25% Wealthier But Showing Signs of Weakness
That chip, along with the custom charging circuitry developed by OLPC and Marvell means that the tablet can be charged by a hand crank at a 10:1 ratio (10 minutes of usage time for every minute spent cranking), or by the optional four watt solar panel cover at a 2:1 ratio on sunny days.
ENGADGET: OLPC's XO 3.0 tablet hands-on (video) Hands-on