These bats can distinguish between the two, and not just with trees, but with any echo that comes in a smooth or rough shape.

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。

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This paint can adhere to any surface, whether it is smooth or rough.

这种油漆能坚附于任何粗糙或光滑的表面。

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Open it and go straight ahead: always straight ahead, over level or steep, over smooth or rough, over dry or wet.

始终笔直往前走去，经过平坦的或是陡峭的地方，经过干燥或潮湿的地方。

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One of my mentors once told me that in order to run a successful company, you need to be exceptional in at least one or two skills, and smooth out the rough edges on everything else.

FORBES: How A Technological Investor Realized His Most Revolutionary Innovation: Put Woman In Charge

The path to your purpose might be hard and rough or it might be easy and smooth.

WHITEHOUSE: Following My Purpose

That reminder is not to impugn the integrity of the minutes or the staff, but there is a natural tendency to smooth off the rough edges of minority viewpoints.

FORBES: What The Fed's Minutes Leave Out