Stoick's tummy gave out a plaintive rumble like a distant underground explosion.

斯托伊克的肚子发出哀怨的隆隆声，就像远处的地下爆炸。

Bogoyavlensky believes a more plausible theory is that the release of methane gas is sparking underground explosions, leaving behind the massive craters.

博格亚仑斯基认为更可行的理论是, 甲烷气体释放造成地底爆炸后这样形成巨大的陨石坑。

His team drilled down to lower a camera. But before they could, Han says the recorder picked up two underground explosions. Their drill holes were then blocked.

他的队伍向地面下进行勘测并投下摄像机。但是在此之前韩表示录音曾表明地下有过3次爆炸。而后他们的挖掘洞口再次被封闭。

The real obstacle to detecting underground explosions wasn't the accuracy of the seismometers, it was the vast amounts of computation required to Fourier transform the seismometer signals.

探测地下爆炸的真正障碍不是地震仪的精度，而是对地震仪信号进行傅立叶变换所需的大量计算。