不可取消的；无法改变的。
有些任务拒绝被中断，这使得它们是不可取消的。
Some tasks simply refuse to be interrupted, making them noncancelable.
但是，即使是不可取消的任务也应该尝试保留中断状态，以防在不可取消的任务结束之后，调用栈上更高层的代码需要对中断进行处理。
However, even noncancelable tasks should attempt to preserve the interrupted status in case code higher up on the call stack wants to act on the interruption after the noncancelable task completes.
本体论与人的本性的相关性决定了本体论不可取消。
It was decided that ontology can not be canceled by the relativity between ontology and human nature.
取消条款：定单一旦被我方接受，没有我方的书面同意不可取消。
Cancellation: Orders, once accepted, are not subjected to cancellation without our written consent.
取消条款：定单一旦被我方接受，没有我方的书面同意不可取消。
Cancellation: Orders, once accepted, are not subjected to cancellation without our written consent.
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