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汉语拼音：shù zhī

遇热变软，具有可塑性的高分子化合物的统称。一般是无定形固体或半固体。分为天然树脂（如松香、虫胶）和合成树脂（如酚醛树脂、聚氯乙烯树脂）两类。是制造塑料的主要原料，也用来制涂料、黏合剂、绝缘材料等。

1. 高分子有机化合物，分天然树脂和合成树脂两大类。松香、安息香等是天然树脂。人工合成的树脂种类很多，如酚醛树脂、聚氯乙烯树脂。树脂是制造塑料的重要原料。

• Pitch bleeds freely from break in the bark.

  树脂从树皮的裂口自然地流出来.

• Some trees afford resin.

  有些树产树脂.

• The resin from which the oil is extracted comes from a small, tough tree.

  用于提取这种油的树脂取自于一种矮小坚韧的树。

• Two of the lorries, carrying industrial resin and paint thinner, burst into flames.

  其中运载工业树脂和涂料稀释剂的两辆卡车起火了。

• Propolis is a hard resinous sub-stance made by bees from the juices of plants.

  蜂胶是蜜蜂用植物汁液合成的像树脂一样的物质。

• This allyl type resin is a highly transparent, colourless material.

  这种烯丙基型的树脂是一种高度透明的 、 无色材料.

• The resin moves intermittently down and out of the bed.

  树脂周期地向下移动和移出床层.

• Birefringence of the cured resin was measured with a senarmont compensator.

  用塞拿蒙补偿器测定固化树脂的双折射率.

• This is referred to as a thixotropic property of the resin.

  这种特性叫做树脂的触变性.

• The first response to diffused water is resin swelling.

  首先受到扩散水影响的是树脂溶胀.

• The resins were used to turn out millions of helmet liners.

  用这类树脂生产了成百万只钢盔内衬.

• Organic rubbers develop a resinous surface crust through weathering.

  有机橡胶经过风蚀后,逐呈现出树脂状的外表.

• The organo functional groups will react with the resin.

  有机官能团将与树脂反应.

• Cheapness is one of the main attractions of polyester resins.

  廉价是聚酯树脂受到欢迎的主要原因之一.

• The mechanism of tackification of rubbers by resins is not completely understood.

  有关橡胶被树脂增粘的机理尚未完全了解.