Annunciator boards
[经] 公告板
🧩 词语组成解析
n. 通报者, 信号器\\n[化] 报讯器
n. 木板, 板子；纸板（board复数形式）
🗣️ 情景例句
Excuse me, where can I find the shoe polish?
问一下，我到哪儿能买到鞋油？
You ought to have that coat cleaned and pressed.
你应该把那件大衣清洗并且压一下。
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。