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。
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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