🗣️ 情景例句
Three. Besides Chinese, my mother tongue, I can also speak English and French.
三种，除了我的母语中文外，我还会讲英语和法语。
You can do it.
你一定可以撑下去的。
a wave length (the horizontal distance between two wave crests),
波长（两个浪峰间的水平距离）