Definition
To euthanize an animal that is suffering from a severe illness or old age to prevent further pain.
使（患病或年老的動物）安樂死，以結束其痛苦。
They had to put their dog to sleep because its arthritis became too severe.
他們不得不讓他們的狗安樂死，因為牠的關節炎變得太嚴重了。
The vet suggested putting the cat to sleep when its kidney failure worsened.
當貓的腎衰竭惡化時，獸醫建議讓牠安樂死。
We decided to put our old horse to sleep as it was no longer able to stand.
我們決定讓我們的老馬安樂死，因為牠已經無法站立了。