🧩 词语组成解析
abbr. CD4细胞；CD4抗艾滋病药（Cluster of Differentiation 4）
cell
[sel]
n. <生>细胞;小牢房;电池;<诗>墓穴;
vi. 住在牢房或小室中;
vt. 囚禁;
🗣️ 情景例句
There aren't too many examples of this style of architecture left these days.
现在这种风格的建筑已所剩无几了。
Let's call it a day
进行某事
Is it very cold in winter?
冬季的天气很冷吗？