Ectomesenchyme
外胚层间(充)质
🗣️ 情景例句
He's so little ... so new.
他这么小……这么幼……
He has a dog.
他有一条狗。
He led me into his room and hurriedly hid a large parcel under his desk.
他把我领进屋，慌忙把一个大包藏到了桌子下面。