Then the tones gradually muted to a dull thud as the jar was filled.
等到坛子快要装满的时候，叮当声便渐渐变成了沉闷的砰砰声。
A sharp crack might remain fairly sharp in granite, but degenerate into a dull thud in sand.
在花岗岩中尖锐的破裂声可以保留相当的强度，而在砂岩中则易变成低沉的轰响。
A sharp crack might remain fairly sharp in granite, but degenerate into a dull thud in sand.
在花岗岩中尖锐的破裂声可以保留相当的强度，而在砂岩中则易变成低沉的轰响。
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