古琴的声音与山间的回声交织在一起，直到音乐家感到自己与自然融为一体。
The sound of the guqin mixed with the echoes from the mountains, until the musician felt he was at one with nature.
该算法使用自适应滤波器跟踪回声信道，使用一个辅助滤波器和自适应滤波器一起完成回声消除。
The algorithm USES an adaptive filter to track the echo path, and an auxiliary filter to cancel the echo together with the adaptive filter.
主动应用声纳并与特殊形态学和生理学调节结合在一起的回声定位，使蝙蝠能用声音来“看”这个世界。
Echolocation, the active use of sonar along with special morphological and physiological adaptations, allows bats to "see" the world with sound.
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