“稀薄的”用英语怎么说？

动物和人在稀薄的空气中都大口喘着气。Both animals and people were gasping for breath in the rarefied air.使用稀薄的混合气,发动机将不能很好地运转,并会出现加速后坐现象或失速停车现象.The engine will not run well with a lean mixture and may stumble or stall.并且我是太稀薄的, 我想要是更加肥胖的废弃...