Informatory
a. (=informative)提供情报的, 增进知识的
🗣️ 情景例句
I'm so excited!
我好兴奋！
Learn to say before you sing.
按部就班。
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低点）、浪高（从波谷到浪峰的垂直距离）