Correct
低空
/ dīkōng /
Strokes
Definition
low altitude
Example
As a Noun
low altitude/level
1
Dīkōng
低空
zhēnchá
侦查
low-altitude reconnaissance
2
Dīkōng
低空
fēixíng
飞行
fly low; fly at a low altitude; low-level flying
3
Kāifàng
开放
dīkōng
低空
kōngyù
空域
gěi
给
tōngyòng
通用
hángkōng
航空
open up the country's low-altitude airspace to general aviation