1939年9月，在德国入侵波兰后，英国对德国宣战。
In September 1939, Britain declared war on Germany after Germany invaded Poland.
1939年，在德国入侵波兰的前几天，601中队被动员了起来。
Days before the German invasion of Poland in 1939, 601 squadron was mobilised.
在签订《慕尼黑协定》和德国入侵波兰这段时间内，欧洲国家，包括苏联，仅有一年的时间去加速军火生产计划的实施。
Between the time of Munich and the German invasion of Poland, the European powers, including Russia, had only a year in which to accelerate their armament program.
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