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.

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。

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This dissertation is devoted to effects of relaxation times on wavelength conversion efficiency based on four-wave mixing(FWM) in semiconductor optical amplifier(SOA).

通过数值求解耦合波方程，研究了半导体光放大器弛豫时间对四波混频波长变换效率的影响。

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