以下为句子列表:
英文: Unfortunately, the solid propellants—usually aluminum fuel and ammonium perchlorate oxidizer—burn fairly inefficiently, are toxic to the environment, and are difficult to fabricate and handle safely.
中文: 然而固体推进剂(通常是铝燃料和过氯酸铵氧化剂)燃烧效率颇低、对环境有害,而且很难安全地制造和操作。
更详细...
|