事前

They used strings previously treated with powdered glass.

他们使用了前用玻璃粉末的绳子。

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

信用管一般分为前、中和后管三个部分，包括前的客户资料收取和客户信用评价、中的债权保障和后的收。