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The bat judges distances by a kind of echo - location.
蝙蝠用一种回声测定法来判断距离.
《现代汉英综合大词典》
This echo - location in bats is often compared with radar, the principle of which is similar.
蝙蝠的回声定位常常可与雷达比较, 其原理是一样的.
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