Rsd
abbr. 无线电科学部（Radio Science Division）
🗣️ 情景例句
Does that make any sence?
这样清楚了吗？
Beauty may have fair leaves, but bitter fruit.
美丽的花或许长好叶，结苦果。
It is fairly clear that sleeping period must have some function,
很清楚，睡眠必然具有某种作用。