Monosymmetric
a. 单轴对称的, 两侧对称的
🗣️ 情景例句
Hello, sir.
您好，先生。
It's $30.00 one way or $55.00 round trip.
单程票价30美元，来回票价55美元。
The porter went to fetch one and arrive back with the station master,
搬运工跑回去取时刻表，同时请来了站长。