例句與造句

1. This work was considerably aided by the capturing of the short signal code books from German submarine U-559 by men from HMS Petard.
2. The fleet however was a Franco-Spanish fleet, somehow in possession of the Royal Navy signal code book, thus permitting the correct response to " Ardent's " signals.
3. It's difficult to find signal code book in a sentence. 用signal code book造句挺難的