英语语法分析

A 6-wheel model of towed howitzer train is made.

建立了牵引火炮列车6轮输入模型；

System optimal design of howitzer is an important tool of system design.

火炮总体优化设计是总体设计的重要工具。

This is the heavy fire-power of the Libyan Army - a 155mm Palmaria self-propelled howitzer.

上图代表了利比亚陆军的强大火力，155毫米Palmaria型自行火炮。