髓磷脂是一种防护物质，它开始覆盖在脊柱的表面。
Myelin, a protective substance, is beginning to coat the spinal column.
髓磷脂是一种防护物质，它开始覆盖在脊柱的表面。
Myelin a protective substance is beginning to coat the spinal column.
施工后表面如有少量白色物质释出，属于正常现象。
It is normal if there is any white substance released from the painted surface.
已知火星表面下面有水的形式物质存在。
One known fact is that there are forms of water under the surface of Mars.
无机矿物质在金属表面高速滑行时，其刮削作用也不小。
Inorganic minerals in the metal surface high-speed taxi, scraping effect is also not small.
无机矿物质在金属表面高速滑行时，其刮削作用也不小。
Inorganic minerals in the metal surface high-speed taxi, scraping effect is also not small.
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