In the spring of 2007 Jason Kilar was trying to beef up the video offerings of his employer, Amazon, the world's largest online retailer, when he got a call from a headhunting firm.

2007年春季的一天，贾森•基拉尔(Jason Kilar)正在绞尽脑汁为他的雇主，全球最大的在线零售商亚马逊网站，扩展视频业务。

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Then the spring force on each one of them — - if I call that the spring force — will only have to be half to counter this force.

它们各自受到的弹力-，如果我称之为弹力-，将只会是，这个力的一半。

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And this is what we call the potential energy of the spring.

弹力势能，这是势能。

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A lot of people call South by Southwest Interactive the geek spring break.

VOA: special.2011.03.14

Then later, when the Earth gets away from the sun and starts to slow down, that's the time of year we call spring and summer.

NPR: Not All Seasons Are Created Equal

Although the seasonal equinoxes and solstices seem to divide the year into four equal parts, when you count the days of what we officially call winter, spring, summer and fall, each season is different, says Bing Quock, acting chairman of the Morrison Planetarium at the California Academy of Sciences.

NPR: Not All Seasons Are Created Equal

That demand comes most vocally from Jean Charest, the premier of Quebec, who is expected to call his own election this spring.

ECONOMIST: Canada