The introduction of processing additives gave better tensile strength of the materials but made them less vulnerable to micro-organism attack.
引进的加工助剂了更好的材料拉伸强度，但使它们不易受到微生物的攻击。
The introduction of processing additives gave better tensile strength of the materials but made them less vulnerable to micro-organism attack.
引进的加工助剂了更好的材料拉伸强度，但使它们不易受到微生物的攻击。
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