地震波沿地球南北两极传播比沿东西方向传播的要快。现在，科学家们认为已找到了这一问题的原因所在。
Seismic waves traveling between Earth’s poles move faster than those moving east-west, and now scientists think they may know why.
地震波沿地球南北两极传播比沿东西方向传播的要快。现在，科学家们认为已找到了这一问题的原因所在。
Seismic waves traveling between Earth’s poles move faster than those moving east-west, and now scientists think they may know why.
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