16.__ 1798,when Eli Whitney came up with a new idea,guns had been made by skilled gunsmiths,one at a time.A to B inC since D until再帮我翻译一下,并说明为什么?

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16.__1798,whenEliWhitneycameupwithanewidea,gunshadbeenmadebyskilledgunsmiths,oneatatime.AtoBinCsince

16.__ 1798,when Eli Whitney came up with a new idea,guns had been made by skilled gunsmiths,one at a time.A to B inC since D until再帮我翻译一下,并说明为什么?
16.__ 1798,when Eli Whitney came up with a new idea,guns had been made by skilled gunsmiths,one at a time.
A to B in
C since D until
再帮我翻译一下,并说明为什么?

16.__ 1798,when Eli Whitney came up with a new idea,guns had been made by skilled gunsmiths,one at a time.A to B inC since D until再帮我翻译一下,并说明为什么?
B in

D, 在1798年eli whitney有一个新想法之前,枪械一直是有技艺精湛的工匠制造,一次只能造一把。 意思就是说直到1798年 这个人出现 枪械的制造工艺才得到了改善