He put a coin into the insertion slot. 他往投幣孔投入一枚硬幣。
Automatic Coin Telephone Service includes a telephone company central office that can complete all types of payphone calls automatically without an operator. 自動投幣電話業務,包括電話公司市話局,可以不需要話務員而自動完成各種類型的公用電話。