Introduced in 1938, the Flying Fortress was the best heavy bomber of the first part of the war, but by later standards it had a fairly small bombload.
绍了于1938年的飞行堡垒是最好的重型轰炸机的第一部分战争，但后来标准已
当小bombload 。
Introduced in 1938, the Flying Fortress was the best heavy bomber of the first part of the war, but by later standards it had a fairly small bombload.
绍了于1938年的飞行堡垒是最好的重型轰炸机的第一部分战争，但后来标准已当小bombload 。
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