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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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

If it is possible for central banks to identify the build-up of financial imbalances in good time, then they can restrain those imbalances, rather than just waiting to offset the economic consequences of their unwinding.

ECONOMIST: Yesterday's financial architecture needs refurbishing