38. may as well notas结构,此结构可译为与其不如不。
One may as well not know a thing at all as know it but imperfectly.
39. have only to do结构,此结构表示只须(消)就能的意思。
We have only to turn to that extraordinary discovery made by Edison to see the significance of it.
40. not unless句型
No increase in output can be expected unless a new assembly line is installed.
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