The helicopter ducked and dived to avoid potential ground fire.

直升机忽上忽下,躲避着可能的地面火力.

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He can fly higher, meaning that he is at less risk from ground fire.

投弹者可以飞得更高一些, 从而使自己受到的地面火力威胁更少.

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An armed helicopter used esp. for protecting troop transport helicopter against ground fire.

专门用于保护兵员运输直升机不受地面炮火射击的武装直升机.

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