但是,橡树的叶子少而又大,反射力较强,会产生参差不齐的声波,或所谓的“粗糙回声”。
But an oak which has fewer but bigger leaves with stronger reflections, produces a jagged wave form, or what we called a rough echo.
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.
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