Operant
n. 发生作用之人或物, 工作之人或物\\na. 动作的
🗣️ 情景例句
Sit down, sit down. Have some coffee.
请坐， 请坐。喝点咖啡。
What is your hurry?
什么事让您这么着急呢？
A woman saw it happen when she was walking past.
一位妇女走过的时候，看到我的钢笔掉了。