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这是一种你永远也听不到的声音,它是由生病的大树发出的痛苦的信号。但是,科学家听到了这种声音;而且他们相信,昆虫也听到了这种讯息,并像秃鹰扑向垂死的动物那样,纷纷向病树扑来。
This is a kind of sound that you can never hear. It is a painful signal from a sick tree. However, scientists heard this sound; and they believed that insects also heard this message and rushed toward the diseased tree like a bald eagle pounced on a dying animal.