drop service meaning in English

发下垫球
发下坠球

Polyvinyl chloride insulated drop service wires
聚氯乙烯绝缘的用户设备引入线
Subscriber can request key - drop service . the company would issue an acknowledge receipt to confirm the subscriber ' s key . ? the company would compensate maximum hk $ 100 in case of loss of the key
如客户要求留钥匙给本公司，本公司将会发出收据给客户。若不幸遗失钥匙，本公司将会赔偿客户最高100元。