Abbreviation of Greenwich Mean Time

• Mean solar time at the Greenwich meridian used as a standard
• The time zone at zero offset, basis for world time

格林尼治标准时间的缩写

• 本初子午线处的平太阳时，用作时间标准
• 零时区，世界时间的基准

Initialism of gelatinous transformation of bone marrow

• A wasting change with hyaluronic matrix replacing marrow fat

骨髓胶样变性的缩写

• 一种消耗性改变，透明质样基质替代骨髓脂肪