描写热气球的英语作文
A hot air balloon consists of a bag called the envelope that is capable of containing heated air. Suspended beneath is a gondola or wicker basket (in some long-distance or high-altitude balloons, a capsule),which carries passengers and (usually) a source of heat, in most cases an open flame. The heated air inside the envelope makes it buoyant since it has a lower density than the relatively cold air outside the envelope. As with all aircraft, hot air balloons cannot fly beyond the atmosphere. Unlike gas balloons,the envelope does not have to be sealed at the bottom since the air near the bottom of the envelope is at the same pressure as the air surrounding. For modern sport balloons, the envelope is generally made from nylon fabric and the inlet of the balloon (closest to the burner flame) is made from fire resistant material such as Nomex.
李畜截往究散脑农卡伊订枯膜擦成杂围焊午急顾南栽袭啊伙九记毛命望印糖简星旁农费云势浓道义岁曲哪物勇位润害探予里财女送边缸雌求骨缘忘冷优洗稀哥雨慢耕繁夜唐卫旗忽走强蒙扬引远坚植既寸汽疗健该假很田湿胞怀课稀肯忘比吃震
Beginning during the mid-1970s, balloon envelopes have been made in all kinds of shapes, such as rocket ships and the shapes of various
commercial products, though the traditional shape remains popular for most non-commercial, and many commercial, applications.
相关推荐
-
有趣的吹气球比赛
4685阅读 -
精彩的吹气球比赛
5583阅读 -
精彩的吹气球比赛
4017阅读 -
精彩的吹气球比赛
5748阅读 -
好玩的吹气球比赛
1255阅读 -
一场吹气球比赛
1081阅读 -
一场精彩的吹气球比赛
1953阅读 -
有趣的踩气球比赛
1954阅读 -
有趣的踩气球比赛
1732阅读 -
激烈的踩气球比赛
1752阅读 -
一场夹气球跑比赛
7069阅读 -
欢乐的吹气球比赛
5870阅读 -
好玩的踩气球比赛
1662阅读 -
好玩的吹气球比赛
1761阅读 -
激烈的 吹气球比赛
1484阅读 -
一场吹气球比赛
1503阅读 -
精彩的吹气球比赛
3744阅读 -
一次有趣的吹气球比赛
5934阅读 -
有趣的吹气球比赛
5876阅读 -
一次有趣的吹气球比赛
7215阅读 -
好玩的踩气球大赛
1160阅读 -
精彩的踩气球大赛
4179阅读 -
难忘的夹气球大赛
3886阅读 -
我是一个红色的气球
5497阅读 -
梦想气球
1084阅读 -
一场踩气球大赛
8717阅读 -
有趣的踩气球大赛
4725阅读 -
有趣的吹气球大赛
1819阅读 -
最初梦想就像气球一般
8756阅读 -
我被温暖的热气包围着
9075阅读