无论是加深自然灰还是尝试大胆风格转变，半永久性的家用染发剂都是一种低风险、低成本获得最新时尚风貌的最佳选择。
Whether enhancing natural greys or experimenting with a bold transformation, semi-permanent home hair dye is a low-risk and inexpensive way to get this latest look.
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.
世界的本质一定是丰富多彩的，有白，有黑，也有灰的；应该是自然的，平衡的，融合的。
The original world must be diverse with white, black and also gray colors, which should be natural, balanced and merged.
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