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SAT改错题thename"transferware"(comesformanineteenth-centurytechniqueforwhich)apatternisengravedontoacopperroll,printedontissuepaper,andtransferredontoearthenwaredishes.()内为要修改的答案是comesfromanineteenth

题目详情
SAT改错题
the name"transferware" (comes form a nineteenth-century technique for which) a pattern is engraved onto a copper roll,printed on tissue paper,and transferred onto earthenware dishes.
()内为要修改的
答案是comes from a nineteenth-centry technique whereby,请问whereby在此处什么意思?如果改成非定语从句的正常句子应该是什么?
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答案和解析
whereby = by which