就在最近，那些家喻户晓的公司，如美国电话电报公司，杜邦公司，摩根大通公司，还有喷气发动机制造商普拉特惠特尼公司，以及矿业公司美国自由港麦克米伦铜金公司，都宣布了裁员。

Just in recent days, household names like AT&T Inc. , DuPont, JPMorgan Chase &Co. , as well as jet engine maker Pratt &Whitney, and mining company Freeport-McMoRan Copper &Gold Inc. announced layoffs.

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而普拉特&惠特尼则正在尝试在风扇和涡轮之间加入一个变速箱，因为风扇低速运转更高效，而涡轮机高速运转则更高效。

Pratt &Whitney is exploring putting a gearbox between the fan and the turbine, because fans run more efficiently at low speeds and turbines operate better at high speeds.

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