英语语法分析

Unfortunately, the polyurethane foam he used is inherently unstable.

不幸的是，他使用的聚氨酯泡沫本身就不稳定。

They're made of polyurethane and not latex.

它由聚氨酯制成，而不是乳胶。

The tires can be protected with tyron bands, runflats, or filled with polyurethane.

轮胎由泰纶带提供保护 能够泄气保用，或是填充了聚氨酯橡胶。