例句與造句

1. 7 permanent weld backing bars , consumable inserts and nonconsumable insert rings are not permitted without prior written approval from secco
   事先沒(méi)有賽科公司的書(shū)面批準(zhǔn)，不允許有永久焊接的支撐桿、熔化性嵌條和不可熔嵌環(huán)。
2. It's difficult to find insert ring in a sentence. 用insert ring造句挺難的