Ectomesoderm
外中胚层
🗣️ 情景例句
He visited with Grandma and me in Florida
他到Florida看过祖母和我
Fame like a river is narrowest at its source and broadest afar off.
名誉像条河，源头最狭窄，远处最宽阔。
Refuse politely any cold drink from an unknown source.
应谢绝任何不明来源的冷饮。