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。
John was not listening and made a random answer when called upon to reply.
约翰没有听讲，当被叫起回答问题时，他胡乱地给了个回答。
So, the day finally came when they were called upon.
于是，有一天他们终于被动员起来了。
When he was called upon to stand up onscreen, he wore metal braces.
拍摄他的戏时，他的脚上带着一个金属支架。
We knew that there would come a moment when we would be called upon.
我们坚信将来有一天祖国会召唤我们的。
We knew that there would come a moment when we would be called upon.
我们坚信将来有一天祖国会召唤我们的。
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