Euthanasia refers to the painless death.

安乐死即无痛苦的死亡。

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Euthanasia is defined as an easy, painless death.

安乐死是一种简单的，无痛死亡。

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Many of the initial problems have disappeared, and the few remaining incompatibilities are dying a quick and painless death.

很多最初的问题已经消失，遗留的少数不兼容问题也正被快速而顺利地解决。

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Mr. SAVAGE: Well, about a year ago, the Lancet - the British medical journal - had a study of several doctors, saying that men who have been executed in the United States may well have suffered excruciating pain that was to some degree masked by the anesthesia - that they didn't get enough anesthesias to actually give them a painless death.

NPR: High Court Allows Lethal-Injection Challenges

For most pet owners a good death means painless euthanasia in either a veterinary surgery or at home.

ECONOMIST: Time to go, or perhaps not?