He can fly higher, meaning that he is at less risk from ground fire.
投弹者可以驾机高飞，避开地面火力的威胁。
Rain dampens surface fuels, but does little more than create a crust over a ground fire, which can burn beneath the surface for months and pop up later.
降水会打湿地表的易燃物，但也不过是在地下火上结了一层壳而已，地下火仍会继续燃烧好几个月，并可能又冒出地面。
Despite the risk from old-fashioned ground fire, particularly in narrow valleys, a ride in a chopper is still better than land travel on ambush-ridden or non-existent roads.
尽管存在着来自传统地面火力的威胁（尤其是在狭窄的峡谷里），乘坐直升机依然要比在暗藏伏击或者根本不存在的道路上行进更好。
The enemy plane was forced down by our ground fire.
我们的地面火力迫使敌机降落。
The enemy plane was forced down by our ground fire.
我们的地面火力迫使敌机降落。
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