At once...and...
既...又...
🧩 词语组成解析
at
[æt]
prep. （表示位置）在;在（某时间或时刻）;以，达; 向，朝;
n. 阿特（老挝辅币单位，100 阿特 = 1 基普）;
🗣️ 情景例句
I'll get you to help serve later.
等一会我会叫你帮忙分菜。
I really don't know.
我真不知道。
How old are you?
你多大啦？