高空 gāokōng high altitude
怎么记住“高空”: 高 high + 空 empty = high altitude.
汉字
用法
- High altitude / high up in the air - 高空作业 (gāokōng zuòyè) working at height, 高空坠物 (gāokōng zhuìwù) objects falling from a height.
- The airspace or elevation high above ground; a safety-relevant term.
- Register: aviation, construction, safety.