Cd4
abbr. CD4細胞；CD4抗艾滋病藥（Cluster of Differentiation 4）
??? 情景例句
I can't figure out why she said so.
我不能理解她為什么這樣說。
To play golf every weekend
每個周末去打高爾夫球
Yes, I have. He's in Sydney, Australia.
有，我有。他在澳大利亞的悉尼。