isn't

英 [ˈɪznt]

美 [ˈɪznt]

is not 的常用口语形式

Collins.5

柯林斯词典

Not all is perfect, but it isn't for want of trying.
一切并非无可挑剔，但已经竭尽全力了。
That isn't a value judgement, it's a fact.
那不是一个价值判断，而是一个事实。
My bank balance isn't very large.
我的银行存款余额不多了。
Isn't dinner ready? I'm famished.
饭好了吗？我都饿坏了。
It isn't too difficult once you get the idea
你一旦弄懂了，就不太难了。
My law practice isn't the most important thing in my life, you know.
你知道，我的律师事务所不是我生活里最重要的事情。
He just isn't in your league.
他和你根本不是同类型的人。
'That's crazy,' I said. 'Isn't it just?' he said
“那简直是疯了，”我说。“谁说不是呢？”他说。
Merely because you believe a thing is right, it isn't automatically so
事情不会仅仅因为你相信它是对的，就会必然如此。
It's a devil of a tricky problem, isn't it?
这是个非常棘手的问题，不是吗？