need作名词时,是用the need of还是the need for,demand呢?

need作名词时,是用the need of还是the need for,demand呢? demand ,need? meet the need （of） sth.应该用介词of还是for? need做名词need作名词时可不可数? point to the need for, 英语翻译UrgencyThis letter stresses the urgency of the need for in need/demand/require the need for money怎么翻译?为什么不是of? you need more pracitce 这里的practice是动词还是名词.need to do 和 need need of water 以及need for water the need for safety precautions为什么用for而不是用of? We need ( ) ( ) actors for the talend show.