The SODIS device is very simple, and USES parts from a keychain that blinks when exposed to light.

阳光杀菌法的装置非常简单，用了钥匙扣的一部分，放在阳光下时它就会闪烁。

youdao

The SODIS device is very simple, and USES parts from a keychain that blinks when exposed to light.

阳光杀菌法的装置非常简单，用了钥匙扣的一部分，放在阳光下时它就会闪烁。

youdao