These walls were originally raised to stop the gradient of over 30% of the natural slope, which is why they are included as part of the formal and structural design.
这些墙壁的建造最初是为了阻止超过30%的自然坡度，这也是它们被纳入正式的结构设计的一部分的原因。
These walls were originally raised to stop the gradient of over 30% of the natural slope, which is why they are included as part of the formal and structural design.
这些墙壁的建造最初是为了阻止超过30%的自然坡度，这也是它们被纳入正式的结构设计的一部分的原因。
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