For instance, many babies are perfectly proficient crawlers, but they decide to try walking because there's more to see and do when they stand upright.

例如，许多婴儿都能非常熟练地爬行，但他们却决定尝试行走，因为当他们站直时，有更多的东西能看和做。

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It is hard for an empty sack to stand upright.

对于一个空口袋来说，直立起来是困难的。

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The EVO has a tiny kickstand to stand upright for video conferencing.

EVO这一型号还配备了一个微型支架以便立置供视频会议使用。

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The major averages kept rising into nose bleed thin air, but the Ag names were struggling to stand upright.

FORBES: POT Is Going Up In SMOKE

The mount allows your iPad to stand upright and be used as monitor.

ENGADGET: Movie Mount turns your iPad 2 into a serious video-making machine

Contestants get one five-minute break every hour, but otherwise must stand bolt upright with one hand on the pickup at all times.

ECONOMIST: Pickup country