例句與造句

1. The total dislocation length per unit volume of material ; alternately , the number of dislocations that intersect a unit area of a random surface section
   材料單位體積內的位錯線的總長度，或者在一個隨機切面上的單位面積內切斷的位錯根數。
2. It's difficult to find surface section in a sentence. 用surface section造句挺難的