Further cushioning is provided by the base material, which is usually made of expanded polyethylene-the same foamy stuff used in cars to provide shock-absorbent surfaces for dashboards and bumpers.
底部的材料通常是由拉伸的聚乙烯材料制成，可以起到进一步的缓冲作用。这种材料和在汽车仪表盘和保险杠表面的吸能泡沫材料属于同一种材质。
This us map comes with 100 LED pins; push them into the map's foamy surface to make contact with the electrical layers below.
这张美国地图带有100个LED图钉；将他们按入地图的泡沫表面，就能与下面的电子层接通。
Aris Katzourakis, an evolutionary biologist at the University of Oxford, and his colleagues recently went on a hunt for fossils of foamy viruses in mammals.
牛津大学的进化生物学家阿里斯·katzourakis及其同事最近在哺乳动物基因组中寻找泡沫化石病毒。
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