Epithelium
n. 上皮\\n[医] 上皮
🗣️ 情景例句
I woke up when I heard someone speak.
一听到有人说话我就醒了。
Knowledge advances by steps not by leaps.
知识的获得是循序渐进而不是突飞猛进的。
When I got to the theatre I found that they had sold all the tickets.
我到剧院时，发现所有的票都售完了。