We swing our arms simply because it would take extra mental and physical effort to keep them still, says Herman Pontzer, a biomechanics researcher at Washington University in st Louis.

根据圣路易斯华盛顿大学生物力学专家Herman Pontzer的说法，我们之所以要摆臂，是因为不这样的话就需要在意识上以及生理上额外花些气力才能使得手臂保持静止。

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Gripping the club, I take a wild and untrained swing at the ball, somehow manage to connect, and send it flying high over the green to drop out of sight somewhere in the water behind the hole.

紧握高尔夫球杆，我胡乱挥杆而去，想一击命中，结果球直接朝绿色地带飞去，最后坠落在水中。

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Nothing here is truly groundbreaking, per se, but it's the first time that we've seen such a giant company take a meaningful swing at a product sector that has caught fire for myriad reasons. 2012 is shaping up to be the year of the inexpensive tablet, but if Intel has its druthers, you'll be shaking off the hype and picking up a full-fledged computing tool instead.

ENGADGET: Intel's Ultrabook portal jabs at limited functionality of tablets