Systema respiratorium
[医] 呼吸系统
🧩 词语组成解析
[医] 系统, 系
🗣️ 情景例句
to serve the senior citizens
为Riverdale的老年人
I took out my pen.
我拿出了我的笔。
I am used to traveling by air and only on one occasion have I ever felt frightened.
我习惯了乘飞机旅行，只是有一次把我吓坏了。