趣英语 / 查找:two” [共找到152条结果]
  • ductwork什么意思?

    n.管道系统...
  • heartwood例句

    Sapwood contains xylem vessels, but not as strong as heartwood.边材含有木质导管, 但不如中心木质那样坚硬.Heavy wood with dark colored heartwood used for ornaments.重硬且心材呈浓色者可供作木艺品制造用.Heartwood from dark brown to purple brown, alternating str...