Made of wood or polystyrene, nesting boards have holes drilled in them for bees to use to build their leafy nests.
巢套板由木头或聚苯乙烯制成，中间钻有小孔，以便蜜蜂用来筑造用树叶做成的巢穴。
Their methods include the use of strips of ion-exchanging plastic, braided with polystyrene to toughen them up....
他们的方法包括利用聚苯乙烯加固的离子交换塑料带。
That's why polystyrene is ideal for use in bicycle helmets and other protective gear.
这也是为什么聚苯乙烯是制作自行车头盔以及其他保护装置的理想材料的原因。
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