invaluable

adj. /ɪnˈvæljuəbl/ C1

极宝贵的；极有用的

Extremely useful or having a very high value.

仙境例句

Two guinea-pigs proved invaluable, holding Bill up when he could not stand.

两只豚鼠可帮了大忙，比尔站不起来的时候，是它们扶着他。