| 摘要 |
A double walled cap comprising a top section having a top and a bottom surface; an inner sidewall having a diameter and having a top and a bottom, wherein the top of said inner sidewall is connected to said bottom surface of the top section; and an outer sidewall having a diameter larger than the inner sidewall diameter and having a top and a bottom; wherein the top of the outer sidewall is connected to the bottom surface of the top section.
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