One theory is that crying may have evolved as a kind of signal — a signal that was valuable because it could only be picked up by those closest to us who could actually see our tears.
有一种进化理论认为，流泪可能被演化为一个有价值的信号，因为它只能让实际上最靠近我们的人可以看到我们在流泪。
One theory is that crying may have evolved as a kind of signal — a signal that was valuable because it could only be picked up by those closest to us who could actually see our tears.
有一种进化理论认为，流泪可能被演化为一个有价值的信号，因为它只能让实际上最靠近我们的人可以看到我们在流泪。
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