When you wave your arms up and down in a straight line，it means"yes"．

当你在一条直线上下挥动手臂时，它的意思是“是的”。

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Pilots from different countries understand body signals if they have the correct training. When you wave your arms up and down in a straight line, it means "yes".

如果接受了正确的训练，来自不同国家的飞行员都能理解身体信号。当你沿一条直线上下摆动手臂时，就表示“是”。

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It's a wave, not a straight line.

生活是不是直线，而是波浪线。

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Because a surfer stays just ahead of the break, a wave that breaks very slowly carries him straight towards shore at only the speed of the wave.

ECONOMIST: On the beach

Loading his rosters with young players and castoffs who came cheaply and fit the bill on the new stats wave, he got the A's into the playoffs for four straight seasons from 2000 to 2003.

FORBES: Sports Business