- 后备军 hòubèijūn reserve forcemilitary forces composed of personnel not currently on active duty; the reserves
- 后备军人 hòubèijūnrén reservistMilitary personnel who are not currently on active duty but are subject to being called up for service in times of war or emergency
- 后备役 hòubèiyì reserve dutyMilitary reserve service for citizens not currently on active duty but not yet retired from military obligation; also called [[预备役|預備役|yu4 bei4 yi4]]
- 后备箱 hòubèixiāng trunkthe storage compartment at the back of a car; trunk or boot