Profile of PVC condole top is empty, both sides is between honeycomb shape is enclosed sheet, has the processing molding tongue-and-groove and convex great.

PVC吊顶型材是中间为蜂巢状空洞、两边为封闭式的板材，有加工成型的企口和凸棒。

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Both sides of the cliffs seem to echo each other, forming into one concave and one convex, like it is split by an enormous axe. Water running through it forms into a waterfall and pool.

左右两侧绝壁一凹、一凸相互呼应，像是被一把大斧硬生生劈开，大水从中流过形成一道由瀑布、深潭串连而成的壮丽峡谷。

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A particular convex polygon with seven sides has exactly one right Angle.

一凸多边形有七条边，但只有一个角是直角。

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