What can be used to measure the time taken for the parachute to reach the ground?

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Whatcanbeusedtomeasurethetimetakenfortheparachutetoreachtheground?Whatcanbeusedtomeasurethetimetaken

What can be used to measure the time taken for the parachute to reach the ground?
What can be used to measure the time taken for the parachute to reach the ground?

What can be used to measure the time taken for the parachute to reach the ground?
可以用什么来衡量降落伞抵达地面的时间?
测量时间当然是用手表了...watch.