The diameter of a round object is the length of a straight line that can be drawn across it, passing through the middle of it. 直径
noun [具体名词] 直径；放大倍数
The dome is 42.3 metres in diameter. 这个穹顶直径为42.3米。
- diameter 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 13 The search for oil
- Lesson 14 The Butterfly Effect
