thunderhead
['θʌndəˌhed]
n.
（雷暴前常见的）雷暴云砧，雷雨云砧，圆块积云;
例句:
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AWACS Thunderhead Enemy ships are firing towards Sand Island. Stop them.
敌舰向沙鸟射击. 阻止他们.
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No wonder! Look! That thunderhead is right overhead now.
难怪! 看! 积雨云现在就在我们正上空.
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AWACS Thunderhead Get above 5,000 feet and stand by!
全机飞至5000英尺以上高空,待命!