Fots
abbr. 光纤传输系统（fiber optics transmission sys-tem）
🗣️ 情景例句
Grandpa taught me.
爷爷教我的。
Open your book,please.
请把书打开。
Please sign here to show that you have received the money.
请在这儿签字以表明你已收到这笔钱。"