一般自然灰岩坑形成机理是由于有份量的水饱和土导致地下石灰岩洞顶层坍塌，或者由于水加宽了石灰岩床的天然裂缝而导致。
Natural sinkholes generally form when heavy, water-saturated soil causes the roof of an underground limestone cavity to collapse, or when water widens a natural fracture in limestone bedrock.
减少你饮食里的饱和脂肪，就能自然而然地减少血液里的胆固醇。
Trim the saturated fat in your diet and you automatically cut the cholesterol in your blood.
相比自然姹紫嫣红，增强的高饱和度的颜色。
Compared to the natural purples, the enhanced ones have higher saturation of colour.
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