The masks are sold from SPFX masks, based in Van Nuys, California.
加州范纽斯的SPFX面具公司出售此种面具。
2
Conclusion SPFX is very effective and safe in the treatment of RTBI in the senile patients.
结论司帕沙星治疗老年患者呼吸道细菌感染疗效肯定、安全。
3
The main character in the film "Hallows Point" wore an SPFX mask, he said, as do the dancing old man characters who perform at Six Flags amusement parks.