蝙蝠蝙蝠是一种让我觉得很奇怪的动物。我这么说是因为,作为哺乳动物,它居然能够飞行;作为能够飞行的动物,非但不是鸟,翅膀上居然连羽毛也不长。而且,大多数具备飞行能力的动物都是在白天出没的,蝙蝠却在夜间活动。后来我又了解到,蝙蝠在夜间飞行所依靠的,居然不是眼睛,不是我曾经认为的超常视力,而是声波,是所谓的回声定位系统。即使学习了这样的知识,我对这知识仍然存疑:声波是看不见的,摸不到的,真是这样的吗?真有这样的“回声定位系统”吗?可惜, Bats Bats are animals that make me feel weird. I say this because, as a mammal, it actually can fly; as a flying animal, not only is it not a bird, its wings do not even have long feathers. And most of the flying animals are during the day, bats are moving at night. Later on, I learned that the bats rely on flying at night, actually not the eyes, not the extraordinary vision I used to think, but the sound waves, the so-called echolocation system. Even after learning such knowledge, I still doubt this knowledge: Is the sound wave invisible or untouchable, is it true? Is there such an “echo positioning system”? Unfortunately,