在这些机枪碉堡后方是更多的铁丝网、更多的壕沟，以及使用混凝土进行强化并能承受炮火轰击的掩蔽部。
Behind the pillboxes were more lines of barbed wire and more trenches and dugouts reinforced with concrete to withstand artillery bombardment.
这是一个重大的改进，以泡沫林冠后方提供更好的可视性和4个20毫米火炮的火力相比增加的Hellcat六个0.50口径机枪。
It was a significant improvement, with a bubble canopy providing much better rear visibility and four 20mm cannon for increased firepower compared to the Hellcat's six 0.50 caliber machine guns.
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