Reinforcement

(n.)

1. reinforcements: extra soldiers of police officers who are sent to a place because more are needed

援军；增援警力

e.g. to send in reinforcements

派出增援部队

2. the act of making sth stronger, especially a feeling or an idea

（感情或思想等的）巩固；加强，强化

e.g. The Chinese dream requires balanced development and mutual reinforcement of material and cultural progress.