事前

They used strings previously treated with powdered glass.

他们使前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.

信管理一般分为前、中和后管理三个部分，包括前的客户资料收取和客户信评价、中的债权保障和后的账款回收。