To lower the balloon ,hot air is released
The rate of change of the altitude of a hot-air balloon is g
The hot air make the balloon stay up.中文是什么
hot-air balloon的意思
The hot air makes the balloon stay up(划线提问) The hot air 划线
rise like a hot-air balloon是什么意思?
fairy,reporter,hot air balloon是什么意思?
first hot air balloon啥意思?
Lifting off at sunrise,the hot air balloon goes wherever the
英语问题10A man is flying in a hot air balloon and realizes he i
You say that will take me to fly in a hot air balloon,across
一个物理题.帮帮,A hot air balloon decends toward the ground with a
求Hot Air Balloon 的中英歌词