A circular letter
通知
🧩 词语组成解析
letter
['lɛtɚ]
n. 信;证书，许可证;字母，文字;字面意义;
vt. 用字母标明;写字母于;加标题;
vi. 写印刷体字母;
🗣️ 情景例句
I care about the practical things.
我关心实用的事物。
The snow will soon be deep enough to ski on.
雪将会很快就积到可以滑的深度了。
Once the existence of this wave-length had been discovered,
一旦这种波长的实际存在被发现，