Unidirectivity
单向性
🗣️ 情景例句
Can you cash this check for me?
你能替我兑现这张支票吗？
How many provinces do you have?
你们有多少个区？
he stooped to talk to a workman.After they had gone on,
途中，停下来与一个工人交谈，接着他们继续往前走去。