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Owing to the difficulty of dealing with substances of high molecular weight we are still a long way from having determined the chemical characteristics and the constitution of proteins, which are regarded as the principal con-stituents of living organisms.
由于处理高分子量物质的困难，我们离确定蛋白质的化学特性和结构还有很长的路要走，而蛋白质被认为是生物体的主要组成部分。