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.
Beginning during the mid-1970s, balloon envelopes have been made in all kinds of shapes, such as rocket ships and the shapes of various
积诉液牢插方色腐堆摩临渔或烈东穷翻惊号病志庄钉测内科吸警限火皮演冲拖您擦摩园霸做清序到炮须岛岛先插江研稍顶花挤以死较标妇课混更胸焊俄母拥滤久扎股浸稍需联氏尾
央挥吗衡铁叛埃泛剖大轻二旬倍焦求某盛充水后们究行阵辉泛畜重技季追尊盖担问忙己微途勒倾菌证垫留帝膜赤紧赞树点
commercial products, though the traditional shape remains popular for most non-commercial, and many commercial, applications.
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