petroresins

例句：

1. 1. The petroresins are usedin the production of plastics.
   石油树脂用于生产塑料。
2. 2. The petroresinshave a high melting point and lowviscosity.
   石油树脂具有高熔点和低粘度。
3. 3. Thepetroresins areextracted from crude oil by chemicalprocesses.
   石油树脂通过化学过程从原油中提取。