四个类别是：1)橡胶隔膜(Rubber-fitted)泵；2)UItra-Flex™隔膜泵；3)热塑料隔膜(Themloplastic(TPE)-FlTTED)泵：4)特氟龙隔膜( Teflorl®-fitted)泵。
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An object made of a soft, pliable material, such as cotton or rubber, and fitted into the ear canal to block the entry of water or sound.
一种由柔软而灵便的材料制成的东西，如棉、橡胶等材料，以嵌入耳道挡住水或声音的进入。
The stress-strain curve of rubber mortar is tested, and then fitted into a curve equation.
测试了废橡胶粉水泥砂浆的应力—应变曲线，并将曲线拟合成方程。
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