diving beetle
noun
1- a predatory water beetle which has fringed back legs for swimming and which stores air under its wing cases while diving龙虱。
1.1
- Family Dytiscidae: numerous genera and species, including the great diving beetle (Dytiscus marginalis).龙虱科：众多属, 众多种, 包括黄缘龙虱（拉丁名Dytiscus marginalis）。