strengthen/ˈstreŋθ(ə)n/
vt., vi.1. 加强；增强Our enemy has greatly strengthened during the truce talks.和谈期间，敌人力量已大为增强。
The front army troops were strengthened by a large contingent of students from the military academy.前线部队得到了一大批军事学院学员的增援。
2. 变强The fence was strengthened with wire.这堵围栏用金属丝加固了。