two sponges
... one buoyant bailer可浮水瓢一个 two sponges海绵两块 two sea-anchors海锚两个 ...
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超级电容也有两块金属片，但其外面有海绵状的多空材料，即活性炭涂层。
Ultracapacitors also have two metal plates, but they are coated with a sponge-like, porous material known as activated carbon.
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请带给我们两块海绵蛋糕。
Bring us two sponge cakes.
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