strengthen
/ˈstreŋθən/verb
- make or become stronger加强, 巩固; 使坚强; 变强：
with obj. he advises an application of fluoride to strengthen the teeth他建议使用氟化物来强固牙齿
no obj. the wind won't strengthen until after dark.风在天黑后才会变强。
短语
strengthen someone's hand（或hands）
- enable or encourage a person to act more vigorously or effectively使做事更强硬; 使行动更有力。
派生词