Free flight models are relatively cheap to build, especially if you go for rubber power.
自由飞模型制作起来相对便宜，尤其是采用橡筋动力。
Today, the most interesting business models are in finding ways to make money around Free.
今日最有趣的营运模式，就是要设法运用免费来赚钱。
Today, the most interesting business models are in finding ways to make money around Free.
今日最有趣的营运模式，就是要设法运用免费来赚钱。
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