Cosmonautics
n. 宇宙航行术, 宇宙航行学
✅ 同义词
🗣️ 情景例句
I can see well both day and night.
我白天晚上都能看得很清楚。
To be of use in the world is the only way to be happy.
为善最乐。
Hello.7-5-4-double 6-2.
喂，7-5-4，两个6，2。