The canister USES a fan to force air through the filter, and then the purified air runs through a hose to the mask.
罐中的风扇使空气流过过滤器，这样净化的空气通过软管达到面具。
2
Anti-psychotic drugs simply mask the raging surges, as though the fire hose were perpetually turned on the blaze so that one can say that the fire is out.