The value of it is never know until it is lost

it is the value of the securities in the The intrinsic value of a coin is the value of the metal it is made of.怎么翻译啊? rue friendship is like health;the value of it is seldom known until it is lost. The value of it is never know until it is lost is the use to which it is put that decides its value of society .的结构. is the use to which it is put that decides its value of society .的结构 for the value of a life is measure by the lives it touches.翻译,介绍词组 Happiness is the trur value of life The value of “Brain Check” is incorrect. 搞不懂,怎么解析#include void main (){int value = 0xFF;printf(The inverse of %X is %X ,value,value);}%x 是表示什么 True friendship is like sound health.The value of it is seldom known until it is lost. The sum or n different postitive integers is less than 50.The greatest possiblv value of n is Often it is in overcoming hardships that we come to appreciate the value of life! True friendship is like health,后面为什么不能是of whose value is seldom known until it lost?答案是the value of which ,可是上面那个很顺啊? We know the value of it is seldom known it is lost ow i want to cry… 翻译it is not the value of the gift that is important 并讲一下这个句子的语法结构 It is not the value of the gift that is important还有那里为什么要用that explain the value proposition and give an exampletalk about it in English first,explain the value proposition what is it means?and talk about the value of the propositionsecond,give an example