be worth your/its weight in gold idiom
非常有用；很有帮助
to be very useful or helpful
This recipe book is worth its weight in gold - it tells you everything you need to know. 这本烹调书非常有用——它会告诉你对烹调所需要了解的一切。
Boys who can sing like that are worth their weight in gold to the choir. 唱得那么好的男孩对合唱队来说是非常有价值的。