Then, you draw a half-circle around each point, in front of the wave, with a radius equal to the wave's velocity multiplied by time – so, 20 centimeters.

然后，你在每个点周围画一个半圆，在波的前面，半径等于波的速度乘以时间——所以，20 厘米。

The team will collect blood, urine, saliva, feces and other samples, measure blood pressure, and monitor the pulse wave velocity of the volunteers, including Zhu himself, to provide samples for follow-up research.

团队将采集包括朱本人在内的志愿者的血液、 尿液、 唾液、粪便等样本， 测量血压，监测脉搏波速度，为后续研究提供样本。