Self-activity
n. 自动；自发活动
🧩 词语组成解析
self
[self]
n. 自己;本人;本性;私利;
adj. 同一的;纯净的;单一的;
vt. 使自花授精;使近亲繁殖;
vi. 自花授精;
🗣️ 情景例句
Chocolate?
巧克力？
I was perfectly aware of this before we married.
结婚前我就完全意识到这个问题。
When several elephants are being trained at one time,
几只象同时训练时，