Years to meet the double spring water, years to meet the double spring good farm.

年逢双春雨水多，年逢双春好种田。

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Based on the mass-period method, a measuring device named double spring inversion pendulum was designed, which could measure the center of mass and moment of inertia of an engine.

基于振动系统质量周期法，设计了一种测试发动机质量参数的双簧倒立摆试验台。

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If I make the spring twice as long, I would get double the extension, because when I have two springs in series, each one, under the influence of this force, will get longer by this amount.

若弹簧长度加倍，拉长刚才的两倍，当我把两个弹簧串联，任何一个弹簧，在这个力的作用下，将会拉长相同的量。

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Jeter is 3 for 11 with a double in five spring training games.

WSJ: Yanks on verge of getting Vernon Wells from Angels

Housing prices for the region, defined as California, Washington, Oregon, Arizona, New Mexico, Nevada, Utah, Idaho, Wyoming, Colorado and Montana, dropped 4.3% in March, making way for a price double dip this spring.

FORBES: Housing Faces "Double-Dip" In U.S. West

Washington prospect Anthony Rendon, the No. 6 overall pick in the 2011 draft, kept up his strong spring with a double and two RBIs.

WSJ: Strasburg strikes out 6, Nats and Mets tie in 10