powder packing

• 粉末装填

powder packing的用法和样例：

例句

1. A saturated uniform packing is difficult to obtain.
   要获得饱和均匀的装填是困难的。
2. You have probably seen these in movies, where the soldiers load the cannon with gun powder and a cannon ball and light it.
   你经常可以在电影中看到，士兵门用火药装填加农炮，然后装入炮弹，接着点火。