| 摘要 |
A bottle cap with improved structure includes a special cap that covers the container and prevents the liquid inside from spills. A hollow arch is mounted on the top of the cap with a hole (i.e., mouth of the container) and a rectangle slot cut out of the top thereof. An arched sliding board is arranged just below the rectangle slot. The sliding board shifts along the two side of the rectangle slot to determine the size of the hole opened.
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