现在主代码的大小减少了更多。
The defenders' artillery was posted to the rear of the main line of trenches.防守一方的炮位被布置在这些主堑壕后方。
We used one for our main line, each person in the family got a number, and we used one for fax.我们用它作为主线,为每位家庭成员都分配一个分机号码,并使用其中一个号码来收发传真。