他观察这些人并测量他们从实验地点走到电梯的速度。
He looked at these people and measured how fast they walk from where their experiment was to the elevator.
然而，杜胜望相信爱因斯坦是正确的，他决心测量单个光子的极限速度，通过这一前无古人的实验来结束这场争论。
Du, however, believed Einstein was right and determined to end the debate by measuring the ultimate speed of a single photon, which had not been done before.
在这个实验中，两个光门测量小球的初速度。
For this activity, two photogates measure the initial speed of the ball.
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