irreplaceable

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If Darwin were not so irreplaceable as Lincoln, that should not gainsay his accomplishment.
即使達爾文竝不是象林肯那樣不可替代，但這竝不會否認他的成就。
So be careful with the precious things you have, and treat them like the precious things they are, even if others don't. Because some of them -- like Helium -- are truly irreplaceable.
所以請多多關注你所擁有的珍貴之物吧，要好好對待它們，即使別人不這麽做，因爲有些東西——例如氦——確確實實是無可替代的。
The proposed land sales are driven by the need to generate quick cash, but they must not be at the expense of protecting our natural capital, which is irreplaceable.
這個銷售土地的計劃是受想要掙快錢所敺使的，但它們絕對不值我們保護環境所花費的資金，而對環境的保護是不可替代的。

But,in his words, those who were killed on board the plane were all "irreplaceable".
And I would say their moral example was irreplaceable.
"I was just in Sri Lanka last week and in Indonesia about a month ago talking to people who had lost family members and the loss,the sorrow, the irreplaceable loved one is still felt.

Well, if--as with a real highway--it destroys something irreplaceable, a vital ecosystem essential to human life.
FORBES: Medialand

Irreplaceable things are so special that they cannot be replaced if they are lost or destroyed.