trial grade

例句：

1. 1. The company is currently testing a new product with a trial grade.
   该公司目前正在测试一款新产品，采用试验等级。
2. 2.The engineers are conducting a trial to improve the efficiency of the production line.
   工程师们正在进行试验，以提高生产线的效率。
3. 3.The trial grade was so good that it won the competition.
   试验等级非常出色，赢得了比赛。