Kēxuéjiā kāifā le yī zhǒng kě jiàngjié de xīnxíng jùhéwù.
Scientists developed a new type of biodegradable polymer.
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聚 (to gather) + 合 (to combine) + 物 (substance) — a substance made of many gathered, combined units. That's exactly what a polymer is: many monomers linked together.