非降解性输尿管内支架管自1967年问世以来，广泛应用于常规的上尿路手术。

The traditional ureteral stent had been widely used in urological surgery since it was first developed in 1967.

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目前缓释农药制剂的载体材料大部分采用聚脲、聚酰胺、聚氨酯等非降解性材料，又给环境增加了新的问题。

Recently polyurea, polyamide, polyurethane and other non-degradable materials which take up most of carrier materials cause new environmental problems.

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这是一种生物可降解的，无毒、非易燃性的燃油。

It's biodegradable, non-toxic, non-flammable, "she says, adding that it's good for the environment, too."

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