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(In the Second World War (1939–45)) the practice of German submarines of operating in groups (treated as plural).
1940s; earliest use found in The Sun.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。