It can wave back when visitors wave at it.
有游客向它挥手的时候它也会挥手致意。
你为什么向他招手？
We wave at Mama, who is all the way down by the fountain now.
于是，我们就朝着在喷泉边上的妈妈挥了挥手。
You need to catch the right wave at the right time and know when to get off.
你需要在正确时间把握正确趋势，并且知道何时脱手。
I'll be back in a moment, and if you need anything at all in the mean time, just wave at me!
我很快就会再过来，如果在这期间您有任何需要，向我挥挥手就行了！
It's best not to raise your hand and wave at them either.
最好也不要举手或向他们招手示意。
Do not drive in the fast lane. Smile and wave at people who pass you.
不要在快车道上行驶。向经过你的人微笑并招手。
Detonation is propagation of a combustion-driven shock wave at or above the speed of sound.
爆轰是一种以冲击波为特征，以超音速传播的爆炸。
I'll be back in a moment, and if you need anything at all in the mean time, just wave at me.
我一会就回来，如果在这期间，您需要什么的话，就向我挥手。
I'll be back in a moment, and if you need anything at all in the mean time, just wave at me.
我一会就回来，如果在这期间，您需要什么的话，就向我挥手。
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