Whaley recalls how at the beginning of the year, when called upon to read, Chris would excuse himself to go to the bathroom.

威利回忆起在年初，当克里斯被叫去读书时，他常常找借口去洗手间。

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These stamps keep our memories organized so when called upon, our brains can reach back and pull the correct time-stamped file.

这些标记帮助我们组织记忆，当回忆某件事时，我们的大脑会查找并调出正确的场景。

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He works hard and he's always ready when called upon to play.

小罗的训练很刻苦，当他被叫上场时，他总是已经准备好了。

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Because of what we know we are capable of achieving when called upon to achieve it.

WHITEHOUSE: President Obama Pushes Clean Energy

Thus, we must be certain the Cold War relics we keep (with their "eight-track tape" technology) function when called upon.

CENTERFORSECURITYPOLICY: Center For Security Policy

There are many mature workers that can outthink and outrun younger workers when called upon to respond to a critical change.

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