" to stop the public being exposed to organic pollution , like bacteria which can cause diarrhea , we add chemicals again in mid - treatment . the mid - treatment tanks all have automatic warning systems . 金门自来水厂厂长翁自保表示,为了不让民众遭受到生物性的污染,像是会拉肚子的菌类,所以我们会在中途加入化学物质,在中间的水塔都有一些自动加药系统。
The Automatic Warning System (AWS) is a form of limited cab signalling and train protection system introduced in 1956 in the United Kingdom to help train drivers observe and obey signals. It was based on a 1930 system developed by Alfred Ernest Hudd and marketed as the "Strowger-Hudd" system.