Risus
笑, 大笑
🗣️ 情景例句
It's mostly young people who take part.
参加活动的绝大多数是年青人。
I remember the girl whose father earns $ 300 a day.
我记得那个女孩的父亲一天赚三百元。
a wave length (the horizontal distance between two wave crests),
波长（两个浪峰间的水平距离）