For centuries it was assumed without proof that guilt was a valuable, perhaps even an indispensable, ingredient of the civilized life.
几百年来，一直都假定犯罪感是文明生命中有价值，甚至是不可缺少的成份。
In its broadest sense, biomedical engineering has been with us for centuries, perhaps even thousands of years.
广义上来说，生物医学工程与我们已经几个世纪以来，甚至数千年。
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