Thrust may be the pressure that may be the alternative of drag. It's the thrust that moves some thing forward. For an aircraft to keep moving ahead, it should have a lot more thrust than drag.^ 二氧化碳雖不助燃，但活性比碳大的金屬（如鈉、鎂、钾）會和二氧化碳進行氧化還原反應，置換二氧化碳中的碳原子
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