B-17s
【航空学】第二次世界大战中使用的一种四引擎中翼轰炸机\\nn. 17's = Flying Fortress
🗣️ 情景例句
Every cloud has a silver lining.
乌云背后是银边，否极泰来。
Is your factory any different from other plastics factories?
你们工厂和其他塑胶工厂有何差别呢？
Two main techniques have been used for training elephants,
驯象有两种主要的方法，