He concluded haunt that hydrofluoric acid is not only harmful to our health, but the problem is if accommodate security worker, the security risks brought on by corrosion!

• 他最后心有余悸地说，氢氟酸不仅对我们身体有害，更要命的是要是溅到安全绳上，安全绳遭腐蚀就危险了！