有东西掉在地上，发出沉闷的声音。
就在这个时候，他们听到了在汽车的一边座位沉闷的声音。
Just at that moment, they heard a thud on the passenger side of the car.
这是每逢寂静的夜晚，船桨在桨架子上发出的那种有节奏的沉闷的声音。
It was that dull kind of a regular sound that comes from OARS working in rowlocks when it's a still night.
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