Valuable documents
[经] 有价证券
🧩 词语组成解析
n. 文档（document的复数形式）
🗣️ 情景例句
Oh, let me help you with this.
来， 我帮你放好。
I'll give you a hand.
我来帮助你。
but that was precisely the idea adopted in some of the early instruments (seismometers) for recording earthquake waves.
但是早期记录地震波的仪器（测震仪）正是采用了这种思路。