Optional extras
[化] 任选附件
🧩 词语组成解析
[计] 附加设备, 额外设备
🗣️ 情景例句
There aren't window seats left, but a few enter seats are open.
那些靠窗的位子已没有了，但里面的位子还有。
I haven't heard from him for a long time.
我很久没有收到他的信了。
No, I think it's open. Look!
不，我想开着呢！你看。