It took years for the Army to hit on a workable strategy for the woodpecker—a lesson that is informing its conservation work today.

军方花了数年的时间才想出一个可行的啄木鸟保护策略——这一教训如今正影响着他们的保护工作。

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The calotype was revolutionary in its use of chemically treated paper in which areas hit by light became dark in tone, producing a negative image.

卡罗摄影法对化学处理纸的使用是革命性的，其中光照区域色调变暗，形成负像。

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The DF 21d's uniqueness is in its ability to hit a powerfully defended moving target with pinpoint precision — a capability U.S. naval planners are scrambling to deal with.

东风21d导弹拥有无以伦比对强大的防御移动目标的精密打击的能力-美国海军计划者一直争夺对付的能力。

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At some point you're going to hit a well here, which is the point where it's most stabilized or at its lowest energy.

直到某一时刻，你会到达这个势阱，也就是体系最稳定,或者说能量最低的位置。

麻省理工公开课 - 化学原理课程节选

Though its career as a hit-maker dried up shortly after its 1986 debut, Crowded House continued to churn out glorious power-pop singles through the early '90s, following the Top 10 gems "Don't Dream It's Over" and "Something So Strong" with a sturdy string of tracks that deftly balance briskness and melancholy.

NPR: Crowded House Won't 'Stop' Sparkling Sadly

Lower subsides will help Sprint offer customers more competitive rates on its wireless plans without taking a hit on its margins.

FORBES: Why Dish Is Playing Hard Ball For Sprint

O2, subcontracted by BT to provide mobile services within the Olympic Village, suffered a glitch this month when a third of its customers were hit by a 24-hour network failure.

MSN: Don't tweet if you want TV, London Olympics fans told