这些蝙蝠能够区分这两种声音，不仅仅是通过树木的回声，而是通过任何平滑或粗糙的回声。
These bats can distinguish between the two, and not just with trees, but with any echo that comes in a smooth or rough shape.
决不显得笨重或粗糙。
上光剂；擦亮剂含有化学媒质或粗糙微粒的一种物质，被用来打光或擦亮一个表面。
A substance containing chemical agents or abrasive particles and applied to smooth or shine a surface.
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