Mesectoderm
中外胚层
🗣️ 情景例句
Hi, honey.
嗨，亲爱的。
He who rides a tiger is afraid to dismount.
骑虎者难下。
He's awful!He telephoned me four times Yesterday, and three times the day before yesterday.
他讨厌透了！他昨天给我打了4次电话，前天打了3次。