The jet stream is a very strong force and pushing a balloon into it is like pushing up against a brick wall, but once we got into it, we found that, remarkably, the balloon went whatever speed the wind went.
急流是一种非常强大的力量，把一个气球推进去就像推着一堵砖墙，但是一旦我们进入其中，我们发现，值得注意的是，无论风速多大，气球都在前进。
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Force
Pushing
Remarkably