period-down-wave 周期下降波
down going wave 下行波
down-going wave deconvolution 下行波反褶积
continuous wave cavity ring-down 连续波光腔衰荡
Continuous-wave cavity ring-down 连续波腔衰荡法
down-hole shear wave hammer 井下剪切锤震源
down L-wave-band orbit time comparison 下行L波段轨道时间比对法
V to signal with a wave to (a driver or vehicle) to stop 挥手叫(司机或汽车)停车
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”。
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”。
As it approaches the coast, the wave slows down to about 20 to 30 miles an hour.
随着海啸靠近海岸，波浪的速度会减至每小时约20英里到30英里。
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