例句與造句

1. Below is a brief description of standard testing performed on all valves as well as optional tests and other special requirements which may be performed at the customer ' s request
   下面是對于所有閥門進行的標準檢測程序的簡單介紹，對于用戶要求的備選檢測程序和其它特殊檢測程序，也相應進行簡單介紹。
2. It's difficult to find optional test in a sentence. 用optional test造句挺難的