to save; to support; to help; to assist

to reinforce

reinforcement; back-up; supporting force

to ask for help

isolated and without help

to help; to assist; to aid

to support (a cause)

backup (Tw)

foreign aid; external aid; (sports) foreign player; player recruited from overseas

hidden ally; powerful support; support; backup

(originally) to provide assistance; (more recently) to show one's support (for a singing idol etc)

to climb up (a rope etc); climbing (plant)

without support; helpless

legal aid (abbr. for 法律援助[fa3 lu : 4 yuan2 zhu4])

domineering; tyrannical

to request help; to appeal (for assistance)

to block reinforcements

to rush to the rescue

humanitarian aid

to besiege and strike the relief force (idiom); strategy of surrounding a unit to entice the enemy to reinforce, then striking the new troops

antichemical rescue