雷很温柔善良。
Naturally occurring radiation varies depending on factors like local geology and altitude. People are exposed to additional radiation when they get an X-ray or fly in an airplane.
正常情况下的辐射量也随地理环境、海拔等因素变化。当受到X射线辐射或坐飞机时，人们就会受到额外辐射。
People are exposed to additional radiation when they get an X-ray or fly in an airplane.
当受到X射线辐射或坐飞机时，人们就会受到额外辐射。
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