This material frays easily.这种材料很容易磨损.The fabric is very fine or frays easily.这种布料非常精细，或者说容易磨损。This dress material frays very quickly when you cut it.这种衣料在剪裁时非常容易磨损....
The miners tunnelled through the mountain to find coal.矿工在山里打通隧道找煤.The rescuers tunnelled their way ( in ) to the pot - holers.救援人员挖地道通向那些探察洞穴的人.They tunnelled along under the walls and up into the woods beyond.他们在围墙下面挖地...