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。
Yeh and Lee also learned from those who came before them.
叶和李还从谁的面前来。
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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