但现在为时已晚 But it's too late now
但为已晚
But it's too late
以上为机器翻译结果，长、整句建议使用 人工翻译 。
但为时已晚：这意味着美国要依赖以40年前的蓝本为基础的更新版飞机。
But it is too late for that: it would mean America relying on updated versions of aircraft based on 40-year-old designs.
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