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壹线生活 on MSN
2 小时
光速力量如此强大,为何人体被光线击中却毫无感觉?
首先需要澄清一个事实:普通光线无法穿透人体。无论什么体质,人体都会挡住从太赫兹电磁波到X光波段之间的所有光子。在这部分光谱中,当光子碰撞到人体,它们的能量会被传递给人体。
来自MSN
3 分钟
知识科普:燕子为什么喜欢在早霞和晚霞中飞翔?
燕子以昆虫为食,此时昆虫活动频繁,燕子自然会在这个时候频繁飞翔来捕食。 - 容易捕捉猎物:傍晚的光线比较柔和,既不会像中午那么刺眼,也不会像夜晚那么昏暗。这样的光线条件使得燕子能够清楚地看到昆虫飞行的轨迹,有利于精准地捕捉猎物。
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