The Engineer may, if in his opinion it is necessary or desirable, issue an instruction that any varied work shall be executed on a day-work basis.

如果工程师认为必要或可行时，可以发出指示，规定在计日的基础上实施任何变更工作。

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You set some registers and issue a system call instruction (or an interrupt) and have the kernel code called directly from the trap handler.

你可以设置一些寄存器，并发出一个系统调用指令(或中断)，并由陷阱处理程序直接调用内核代码。

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As an effective way of realizing the education goal and ensuring the smooth instruction, classroom discipline has always been an important issue which educators focus on.

课堂纪律作为保障课堂教学活动顺利进行以实现教育教学目的的手段，是人们一直关注的重要议题。

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