23. The reason why rockets work in space is the conservation of momentum.

23. 火箭在太空中工作的原因是动量守恒。

The EmDrive is a theoretical thruster that uses reflected microwaves to create huge amounts of thrust without using a propellant like gasoline; thus violating several laws of physics, including the conservation of momentum.

EmDrive 是一种理论上的推进器，它使用反射的微波来产生巨大的推力，而无需使用像汽油这样的推进剂；因此违反了几条物理定律，包括动量守恒。