At-
pref. 被动现在分词（进行体）
🧩 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 think I'll need your expert assistance this afternoon.
我想，我今天下午需要你专业的协助。
Ill news never comes too late.
坏消息来得快。
She walked slowly into the hall and at once noticed that all the room doors were open,
她慢慢地走进前厅，立即发现所有的房门都敞开着，