例句
柯林斯高阶英汉双解学习词典释义
英汉词典释义
英英词典释义
  • Adjective
    1. having or localized centrally at a focus;
    "focal point""focal infection"
    2. of or relating to a focus;
    "focal length"
行业词典
  • 体育: 交叉点;
    医学: 病灶的,灶的;焦点的;