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
She majored in math and physics at university.
她在大学里主修数学和物理。
Why didn't you say so?
为什么不早说？
Thanks for the party last Sunday. I enjoyed it very much.
感谢你上个星期天的聚会。我非常快乐。