Echinozoa
有棘亚门
🗣️ 情景例句
Try again.
再试一次。
No man (or one) is born wise or learned.
人非生而知之者。
Sometimes the secrecy goes to such an extent that the whole nature of the research cannot be mentioned.
有时，保密竟达到了这样的程度，即连研究工作的整个性质都不准提及。