New solutions offer suntans without the sun.

新的解决方法提供不需太阳的日晒。

The ultra violet (UV) rays that cause suntans also cause a kind of chemical, called endorphins, to be released into the blood.

造成皮肤晒黑的紫外线，也会造成一种称为脑内啡的化学物质被释放进血液中。