时强时弱的隆隆声；断断续续的隆隆声rumble; fluctuating rumble; intermittent rumble

• 远处隐约的隆隆炮声

  faint rumble of distant guns

• 隆隆的马达声

  rumble of a motor

• 钻机的隆隆声

  noise of a drill

• 炮声隆隆

  rumble of gunfire

• 雷声隆隆

  rumble of thunder

• 装甲列车隆隆地向前冲去。

  The armoured train rumbled onward.