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1. কৃত্রিমভাবে তৈরি পলিমারের আয়ু বেশি, 2. ইচ্ছামতো আকৃতি দেওয়া যায়।
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1. কৃত্রিমভাবে তৈরি পলিমারের আয়ু বেশি, 2. ইচ্ছামতো আকৃতি দেওয়া যায়।