主要武器

• main armature
• primary armament

例句

1. 治理这里视觉污染的主要武器是通过一项法律，对路旁广告标志的种类、尺寸大小、数量及放置地点予以限制。
   The chief weapon in the arsenal of those fighting visual pollution here is a law that restricts the type, size, number and placemen of roadside advertising sign.