In four locations where a sunspot was soon to emerge, acoustic waves returned to the solar surface with anomalous rapidity-more than a dozen seconds faster than normal.
在有黑子将要浮现的四个地方，返回到太阳表面的声波异常迅速- - -比正常情形快了至少十二秒。
The switching from normal dispersion to anomalous dispersion is obtained by varying the intensity from couple to probe transition.
通过改变耦合到探测跃迁的驱动场强度，可以实现从正常色散到反常色散的转换。
It is shown that for each case, the medium exhibits either normal or anomalous dispersion at the same frequency regime.
结果表明，对于每一种情形，在同一频率区域系统既能呈现正常色散，也能呈现反常色散。
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