That development compressed the work of five operatives into the work of a single worker – typist, compositor, editor, proofreader, layout artist.
当时五个人的工作（打字员、排字员、编辑、校对员、版面设计员），现在压缩成祇需要一个人。
2
I was a careful proof-reader in those days.
（其实）那个时候的我是一个认真的校对员。
3
I feel the more inclined to emphasise this caution because I once had a rather embarrassing and pointed proof of its desirability, -- which I relate for the enlightening of the reader.