Operant
n. 发生作用之人或物, 工作之人或物\\na. 动作的
🗣️ 情景例句
It's our family tree.
这是我们的家谱。
An evening red and a morning grey, is a sign of a fair day.
晚霞红如火，晓色青如灰，定是晴朗天。
What's up?
怎么了？