Waller
n. 石垛工；煤矿井下充填工
🗣️ 情景例句
This weekend I'm going to install a home security system.
这个周末我要装一套家庭保安系统。
He who has not tasted bitter knows not what sweet is.
不吃苦中苦，哪知甜中甜。
Shut the door, please.
请把门关上。