Gas-filled models are pretty uncommon now because of the extremely high cost, so the eighty other balloons in today's launch are hot air, heated by propane burners.
因为极高的成本，充气的型号现在很少见。所以今天起飞的另外80是个气球是热气（球），由丙烷燃烧器加热。
Propane burner
原声例句
老托福 93篇
英语百科
Gas burner
（重定向自Propane burner）
A gas burner is a device to generate a flame to heat up products using a gaseous fuel such as acetylene, natural gas or propane. Some burners have an air inlet to mix the fuel gas with air to make a complete combustion. Acetylene is commonly used in combination with oxygen.
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