propellant block

例句：

1. 1.The rocket uses a propellant block to power its thrusters.
   火箭使用推进剂块来提供其推力。
2. 2. The scientist discovered that the propellant block had been contaminated with radioactive material.
   科学家发现推进剂块被放射性物质污染了。
3. 3. The engineer carefully removed the propellant block from the engine to replace it with a new one.
   工程师小心地从引擎中取出推进剂块，并用新的替换它。