随着心室的收缩和舒张将血汞到了全身，心脏跳动一次，电波横穿心脏一次。
An electrical wave traverses the heart each time it beats, co-ordinating the contraction and relaxation of the chambers that pump blood around the body.
X射线第一次被观察和记录是在1895年，当时德国科学家威尔姆·康拉德·伦琴在使用真空管做实验时意外发现了X射线。与光线和无线电波一样，X射线也是一种电磁辐射。
X-rayswere first observed and documented in 1895 by Wilhelm Conrad Roentgen, a Germanscientist who found them quite by accident when experimenting with vacuumtubes.
这一次，如果你们听懂了的话，灵魂具有特定带宽的无线电波频率的场强，如果你调节到那个频率，收听它，它就会告诉你所有的事情。
This time, if you have understood, the soul has the strength of radio frequency of a certain bandwidth and strength and if you tune to it, you listen to it, it will tell you the whole story.
作为一次练习，估算了测控通信系统的工作频率、电波穿过“黑障”区的衰减常数；
As an example, the operation frequency of TT&C and data transmission(TTC&DT) and the attenuation constant of electromagnetic wave through the blackout zone are estimated.
一次，飞行员不得不给控制塔发出电波。
一次，飞行员不得不给控制塔发出电波。
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