dì zhì : yě jīn : jiàn zhù > bǎo xiǎn zhuāng zhì



mùlù ·yīngwénjièshì ·bāo hán cí ·gèngduōjiéguǒ... yīngwénjièshì :  fool proof device,  safety appliance n.:  cutout,  safeguard,  Safety,  safety device bāo hán cí dī shuǐ wèi bǎo xiǎn zhuāng zhì