The return signal thus provides a good estimate of the number of cranberry clusters in a given plot.

因此，返回的信号可以很好地估算指定区域内蔓越莓群的数量。

The rest of the Greeks sailed off to a nearby  island to wait for the signal to return.

其余的希腊人驶向附近的一个岛屿，等待信号返回。

When all is working perfectly, the return signal for Cryosat 2 comes exactly from the boundary between the ice and any overlying snow.

当一切正常运行时，Cryosat 2的返回信号就会准确地从冰和覆盖积雪的边界传回来。