However, it wasn't until 1987 that the rotary action electrical toothbrush appeared in the shops.
然而，直到1987年商店里才出现可旋转操作的电动牙刷。
PS is a polystyrene plastic, easy coloring, transparency, and more for the production of lamp shades, toothbrush handles, toys, electrical parts and components.
PS是聚苯乙烯塑料，容易着色、透明性好，多用于制作灯罩、牙刷柄、玩具、电器零部件。
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