Underground activities
[法] 地下活动
🧩 词语组成解析
n. （activity复数形式）活动；活动区；活动性
🗣️ 情景例句
How much do I owe you?
我应付多少？
He informed them that his mother had died.
他通知他们的母亲死了。
It was upon this principle that the first instruments were made,
据这一原理，制造出了最初的地震仪器，