The sky was boundlessly clear when the plane took off.
Tips
usage
A descriptive set phrase (not a classical chengyu with a single source text) — works interchangeably with 万里无云 in weather descriptions. Common in weather reports, travel writing, and hiking/photography posts.
memory
Literally 'clear-sky-ten-thousand-li': 万里 (ten thousand li, ~5000 km) is the stock figure in Chinese for 'vast expanse'. Pair with 无云 ('no clouds') and the sky goes on forever.
