high energy density短语¹⁴⁴⁹⁷²⁺² 基本例句 高能量密度 Besides having a high energy density, the long chains of hydrocarbons are also good building blocks for constructing more complex molecules, such as plastics and pharmaceutical drugs. 除含有高能量外，长链碳氢化合物也适合构建更复杂的分子，如塑料和药品。 yeeyan