🧩 词语组成解析
fern
[fə:n]
n. <植>羊齿植物，蕨类植物;
🗣️ 情景例句
I'll get it. Hello.
我去开门。哈啰。
My aunt will come to live with me for some days.
我阿姨会来和我住一些日子。
a wave length (the horizontal distance between two wave crests),
波长（两个浪峰间的水平距离）