例句與造句

1. The fining grains of al - l % si could accelerate the fatigue crack propagation from the near threshold zone to paris zone
   隨著疲勞裂紋擴(kuò)展速率從近門檻值區(qū)向paris區(qū)過(guò)渡，細(xì)小的a ( a1 )晶粒會(huì)加速疲勞裂紋的擴(kuò)展。
2. It's difficult to find threshold zone in a sentence. 用threshold zone造句挺難的