| 1 | And so you get all this useful information in astronomy by making the Doppler shift measurements of binary systems. | |
| 2 | She may listen for your baby' s heartbeat with a handheld ultrasound device called a Doppler although it's still very early. | |
| 3 | 在几周内，你可能还不能够通过声波图或者多普勒超声听到婴儿的心跳，但当你最终听到时，那快速的断断续续的节奏巩固你身体里有个小生命的证据。 While you may not be able to hear the heartbeat through a sonogram or Doppler for a few weeks yet, when you finally do, the rapid staccato beats will be concrete evidence of the life inside you. | |
| 4 | Even though I was warned it may be too early to hear anything, I was disappointed when the Doppler came up silent. | |
| 5 | Sometimes it can take years to sort out these Doppler observations. |
