The reasons why F-22 hasn′t converted into a carrier-based aircraft are presented, which include affordability, progress, maritime operation requirements and adaptation and so on.
从经济可承受性、进度、海上作战需求和航母适配性等方面,论述F-22未能成为舰载战斗机的原因。
Unfortunately, weight loss diets don't work very well, and that's one of the reasons why there is always a diet book on the best-seller list.
很不幸,食品减肥的作用不明显,正因为如此,最畅销书榜才总有减肥食品的书上榜
And as I will explain in a second there are many reasons why this sense hasn't really been elucidated at the molecular level.
难以真正从分子学的角度阐明,这种感官的原因是多方面的,有关这一点,稍后我会另行解释。
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