計算機專業英語(霍洪濤)課件Chapter 4

謝謝 * Chapter 4 Operating System Review 前驅，前任 后繼，繼任 常見的 足夠的 有時；在某種情況下 不局限于 目錄，存貨清單 支付、支出 偽碼 * predecessor successor commonplace not limited to inventory disburse pseudocode under certain circumstance sufficient Unit 1 Operating System Structure Writing programs that keep track of all these components and use them correctly, let alone optimally, is an extremely difficult job.(P68P2L4) 寫一個能跟蹤所有組成部分、正確地使用它們的程序是一項極其困難的工作，更不用說對其進行優化了。 句子分析: 主干 從句 keep track of 跟蹤 let alone 更不用說/不干涉，不打擾，不管 Let him alone. He needs a rest. 別去打擾他，他需要休息一下。 * Writing programs is an extremely difficult job. … programs that keep track of … Unit 1 Operating System Structure lump(P68L1) n. 塊；腫塊 a lump of… 一塊。。。 I noticed a lump in her skin. 我注意到她皮膚上有個腫塊 a lump in the throat 如鯁在喉 earn its keep(P68L3) In each case, retailers will carry only content that can generate sufficient demand to earn its keep.在這些行業里，商家的進貨必須要保證有足夠的銷量，才能勉強為生。 * 勉強為生 The Structure of A Computer System Unit 1 Operating System Structure * Unit 1 Operating System Structure At the bottom is the hardware, which in many cases is itself composed of two or more layers. The lowest layer contains physical devices(p68RP2L1). 在最下面的是硬件，很多情況下都是由兩個以上層次組成。最底層含有物理設備。 Next comes a layer of primitive software, called microprogram, that directly controls these devices and provides a cleaner interface to the next layer(p68RP1L1). 接下來的一層是簡單的軟件，叫做微程序，用來直接控制設備，并且為下一層提供更為干凈的界面。 * Unit 1 Operating System Structure In machine language layer, the input/output devices are controlled by loading values into special device registers(p69P1L2). 在機器語言層，輸入/輸出設備被控制著把值放入到特殊的設備寄存器中。 A major function of the operating system is to hide all this complexity and give the programmer a more convenient set of instructions to work with(p69P2L1). 操作系統的重要功能就是隱藏所有這些復雜的事物，給程序員使用一組更方便的指令工作。 * Unit 1 Operating System Structure On the top of the operating system is the rest of the system software(p69RP1L1).

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