雙語暢銷書《艾倫圖靈傳》第8章:水銀延時線(30)
As for the engineering of the logical control and arithmetical circuits ('LC and CA'), he wrote:
Work on valve element design might occupy four months or more.
研究電子管的設計可能需要四個多月，In view of the fact that some more work needs to be done on schematic circuits such a delay will be tolerable, but it would be as well to start at the earliest possible moment. ...
但鑑於電路設計也還需要很多時間，所以這個耗時是可以接受的，但必須要儘快開始做……
In view of the comparatively small number of valves involved the actual production of LC and CA would not take long; six months would be a generous estimate.
生產用於邏輯控制和算術電路的少量電子管不需要太多時間，保守估計只需要6個月。A great many of the 'schematic circuits' were already planned out in the report.
在這份報告中，許多電路都已經設計好了，He included a detailed design of the arithmetical circuits, making use of (and extending) von Neumann's notation.
包括算術電路的詳細設計。圖靈參考（並擴展了）馮·諾伊曼的格式和寫法，Perhaps he had the pleasure of drawing upon his experience in designing a binary multiplier before the war.
也許還結合了他在戰前設計二進制乘法機的許多經驗。There was also another feature of the design which might well have harked back to an earlier experience.
這項設計還有另外一個特徵，也利用了他過去的經驗，There was to be a facility for plugging in special circuits, if these were required, for operations over and above the arithmetical and Boolean functions that were permanently incorporated in the machine.
那就是這臺機器在必要的時候，可以通過一個設備來插入特定的電路，以通過硬件方式來執行特定的算術或邏輯運算。This idea was rather at variance with the principle of putting as much as possible into the instructions, but it might be appropriate if some exceedingly efficient special-purpose circuit were at hand.
這個想法，與圖靈"儘量用指令來代替硬件"的原則是矛盾的，但是，如果在執行一些特定任務時，正好有一些效率極高的電路可用，那麼這種做法就是很合理的。This had been the case, for instance, with the Bombes.
比如說，炸彈機就是這種情況的一個典型例子，Here the steps which depended upon relay clicks were slow by electronic standards.
它的工作過程，如果通過繼電器和指令表來實現，就會非常慢，But the steps which depended upon electricity flowing through the internal Enigma wirings were effectively instantaneous.
但如果直接將謎機電路接入，那就只需要一瞬間。Alan's design allowed for such short-cuts to be taken, if desired.
圖靈的設計，考慮到了這種捷徑，在必要的時候，能提供另一種可能。
