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Earth science
Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.
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緊急運輸
Military; General military
情況創建的正常運輸能力的和阻撓要求軍事運動，足夠大的短缺，這需要特殊行動由主席或其他指定的權力，以確保重要的國防交通的不斷的遷移。 ...
聲納浮標
Military; General military
用於檢測的聲呐設備淹沒潛艇，啟動時，通過無線電中繼的資訊。可能主動定向或 nondirectional，或它可能是被動定向或 nondirectional。
