Haeckel's gastrea theory
[医] 黑克耳氏原肠祖学说
🧩 词语组成解析
n. 原肠动物
🗣️ 情景例句
Didn't we go to school together?
我们以前在一起上过学吗？
There are spots in (or on) the sum.
人孰无过。
he hardly ever used it, preferring always to go on foot.
但却很少使用，常常喜欢以步代车。