空心

• You start at a solid circle and end at a target
  从实心圆开始并以空心圆结束。
• The jack - o - lantern is the symbol of halloween
  “空心南瓜灯”是万圣节的象征。
• Long extension hollow crossed universal coupling
  长伸缩空心十字轴式万向联轴器
• Long - extension hollow crossed universal coupling
  长伸缩空心十字轴式万向联轴器
• Analysis of ion thruster hollow cathode failure mode
  离子发动机空心阴极失效形式分析
• Research on steel slag concrete small - sized hollow block
  钢渣混凝土小型空心砌块研究
• Test methods for the small concrete hollow block
  混凝土小型空心砌块试验方法
• A study of glass microsphere thermal barrier coating
  空心玻珠保温涂料的研制
• Test method for detention hollow metal vision systems
  拘留用空心金属可视系统试验方法
• Lightweight aggregate concrete small hollow block
  轻集料混凝土小型空心砌块