Ffm
[医][=fat-free mass]脱脂物质，无脂肪物质
🗣️ 情景例句
When you feel your life is threatened, just dial 999 to get help.
当你的生命受到威胁的时候，拨打 999 求救。
Today is the first day of spring.
今天是春天的第一天。
They have found that it is connected with the passage of days and the phases of the moon.
他们发现代码与昼夜更迭和月亮圆缺有关，