Periodism
週期型; 週期性
🗣️ 情景例句
Typing is easy once you get the hang of it.
一旦你掌握诀窍，打字就很简单。
The houses downtown are very expensive.
市区的房子很贵。
The first records the arrival of longitudinal vibrations.
首先记录下的是纵向波的到达；