The liquid crystal layer is positioned between the first substrate and the second substrate, wherein the gap and the liquid crystal layer are wound by the frame gum.

液晶层则位于 第一基板与第二基板之间，其中间隙物与液晶层被框胶所环绕。

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And be gentle: If you're too rough, you can cut into the gum and cause bleeding or even a soft-tissue wound over time.

WSJ: How to Be a Better Flosser