Yeh and Lee knew that wind would change their contraption's course after launch, so they went on a free Web site to try to calculate roughly where the balloon would go.

叶和李知道风会改变他们的玩意儿在发射后的课程，所以他们一到免费网站尝试计算大致如气球会去。

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Yeh and Lee also learned from those who came before them.

叶和李还从谁的面前来。

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