two fortresses
两个堡垒
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Financial constraints eventually limited the number to three fortresses, completed by April 1942, although two further structures were built in Hamburg and Vienna.
财政紧张最终使堡垒的数量缩减为3个，并于1942年4月完工，尽管此后在汉堡和维也纳又修建了两座同样的建筑。
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