高优先级不可抢占任务具有先得到响应的权利，但不对当前正在执行的任务进行抢占；

Then, tasks were divided into three levels: high-priority tasks with preemption, high-priority tasks without preemption and common tasks.

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最后，在早期的内核中，抢占是不可能的；这意味着如果有一个低优先级的任务在执行，高优先级的任务只能等待它完成。

Finally, preemption wasn't possible in the earlier scheduler; this meant that a lower priority task could execute while a higher priority task waited for it to complete.

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很多公司选择了直接推出不可调光或TRIAC调光LED照明器具，从而抢占成本先机。

Many will simply decide to create a non-dimmable or TRIAC dimmable LED fixture and win on cost.

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