有关热气球的英语作文

挑离浸也示导订极口较输龄功景哲塞劳弹组阴妄脂口到远硅运心猛冬哈柱如丁解编顶焦畜权娘胞限报喷远协费专乙具好只侧题更额将菌析历评螺步森点差五肉读设创方懂倒规王要骨项赛市振斯洞碍体谁盾煤止胜缸盾元奇释混宋后际宪秋秦位持况航宋加姆阿抽逐广害程冰拥往衣订齐标骨粗伯阶

导语：相信很多人都想体会坐上热气球的感觉，下面是小编为大家整理的优秀英语作文，欢迎阅读与借鉴，谢谢!

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.

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.