一个意料外的障碍是，尽管在相当近的距离内传输效率很高，可一旦和传输器的距离达到几毫米，效率就会跌到零。
The snag, however, has been that while efficiency is good at close contact, it can drop to zero at even a few millimetres from the transmitter.
它不仅有很高的几何传输效率，而且还可以大大地提高泵浦的均匀性。
It has a higher geometrical transmission efficiency as well as a better pumping uniformity.
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