Bff
abbr. 永远最好的朋友（Best Friend Forever）
🗣️ 情景例句
We can write letters. It's cheaper than calling.
我们可以写信就好，那比打电话便宜。
When can you pick up your ticket?
你什么时候可拿到车票呢？
he identifies himself with its centre of gravity, its mass, its weight;
他把自身和物体重心、质量、重量融为一体。