Mesectoderm
中外胚层
🗣️ 情景例句
Hey, let me take your picture!
嘿！让我给你拍一张照
My sweater is blue.
我的毛衣是蓝色的。
One of the most famous sailing ships of the nineteenth century, the Cutty Sark, can still be seen at Greewich.
人们在格林威治仍可看到19世纪最有名的帆船之一“卡蒂萨克”号。