The air smelled like wood smoke and we could hear the low rumble of vaporetti cruising the Grand Canal.
空气中飘着柴火烟的味道，听得见大运河上的水上巴士发出低沉的辘辘声。
When morning came, they started again. Before they had gone far they heard a low rumble, as of the growling of many wild animals.
第二天早晨来临时，他们又出发了。他们还没有走多远，就听到了一种低沉的隆隆声，就像是好多野兽的吼声。
The dog gnawed the bone, turned it over, licked it, and sometimes made a low rumble or growl, similar to a cat's purring.
牠啃着骨头，翻来覆去地舐它，有时还会发出低沉、咕噜咕噜的咆哮声，好像猫儿发出的叫声。
The dog gnawed the bone, turned it over, licked it, and sometimes made a low rumble or growl, similar to a cat's purring.
牠啃着骨头，翻来覆去地舐它，有时还会发出低沉、咕噜咕噜的咆哮声，好像猫儿发出的叫声。
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