But, he says, there is not enough evidence to justify measuring these in everybody.

但是并没有足够的证据来判断这对所有人都是行之有效的。

youdao

But, again, measuring the speed and distance to these objects is difficult.

但是，测量这些物体的速度和距离又是很困难的。

youdao

But, again, measuring the speed and distance to these objects is difficult.

但是，测量这些物体的速度和距离又是很困难的。

youdao