The principle of intracavity laser absorption and the relationship between gas concentration and the laser build-up time is outlined.

介绍了掺铒光纤激光器内腔吸收谱的基本原理，以及激光激射延迟时间与气体浓度的关系。

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"The squirrel took a lot of time to build up enough courage to snatch the nut," she said.

“松鼠花了很长时间才鼓起足够的勇气去抢坚果。”她说。

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The strategic regulation of evening body reserves is also likely to incur additional costs, as nightingales must spend more time foraging in order to build up larger body reserves.

晚间的身体储能的策略管理机制，也会产生额外的能量支出，这样夜莺就必须花更多时间找食物，来增加储能。

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Danny Grainger's 20-yard free-kick forced United keeper Dusan Pernis into a save in the build-up to half-time, then Morais blasted a decent ball over the bar following a goalmouth scramble.

BBC: David Goodwillie

After several years--the time needed to build up the assets to realize the economies of scale--workers would have the opportunity to allocate their funds among any qualified investment accounts that met reasonable and specific standards.

FORBES: Fact and Comment

We now know that the arms build-up by the Soviets at that time was an act of desperation.

CENTERFORSECURITYPOLICY: 'Courage'