木材是不溶不熔的材料。

Wood is inmeltable and insoluble material.

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显而易见，只讨论熔体输送而不讨论物料熔融，对全面研究双螺杆挤出理论是很不够的。

It is obviously that only taking account of melt handling without considering material melting is not suitable to study twin screw extrusion theory thoroughly.

youdao

不熔凝胶与周围树脂有同样的熔点，但是受热温度比平均温度低。

Unmelted gels have the same melting point as the surrounding resin, but remained colder than the average melt temperature.

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