试车使用的推进剂具有易挥发、易爆炸、易燃烧等特点，使得试验过程具有很多不安全因素，危险性大。
During the test, so much volatile and burnable propellant is used that the process is dangerous and influenced by many factors.
试车使用的推进剂具有易挥发、易爆炸、易燃烧等特点，使得试验过程具有很多不安全因素，危险性大。
During the test, so much volatile and burnable propellant is used that the process is dangerous and influenced by many factors.
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