塑料

• Sometimes the density of crazes is sufficient to give the stressed plastic a milky appearance .
  有时小裂纹密度很大，使受应力的塑料外观呈现乳白色。
• Fiber glass is a composite containing a plastic strengthened by the addition of glass fibers .
  玻璃纤维是借外加玻璃丝以增强塑料强度的一种合成材料。
• It helps the diver to see clearly under water because it has glass or plastic "windows "
  它能帮助潜水员在水下看得清楚，因为它有玻璃或塑料“眼镜”。
• Two common methods of manufacturing plastic articles are by extrusion and by injection moulding .
  生产塑料制品的两种通用方法是挤出成型法和注射成型法。
• The bag is purged and filled with samples using a rubber squeeze bulb or other pumping devices .
  先排空塑料袋，再用橡皮压挤球或者其它泵类装置将样品充入袋内。
• Plastic foams are perhaps only 1/5 as effective as a good dewar from a heat transfer standpoint .
  从热传输的观点来看，塑料泡沫的效率只及好的杜瓦瓶的五分之一。
• For faster growing cultures the bags may have to be punctured to allow a more rapid air exchange .
  生长快的培养体可能应该把塑料袋刺破，以利于气体更迅速的交换。
• In the other house, the draperies were of vinyl plastic, and rugs and clothing were made of wool .
  在另外一幢房子里，窗帘是乙烯基塑料制成的，地毯和衣物都是羊毛的。
• They may also be manufactured from non-crystalline materials such as glass, cellophane or transparent plastics .
  它们也可用外晶体材料，例如玻璃、赛璐珞或透明塑料等制造。