They used strings previously treated with powdered glass.

他们使用了前用玻璃粉末处理过的绳子。

Credit management is divided into prestage, inbetweemstage and poststage, including the information about a customer as well as its credit status, pledge, and collection.

信用管理一般为前、中和后管理三，包括前的料收取和信用评价、中的债权保障和后的账款回收。