在开始之前，我在教室里随机选择了几张课桌--参照教室半满时人们通常选择的位置--在上面放上了一共5张20美元钞票。

Before the session began, I placed five $20 bills on random desks throughout the classroom--based on where people typically sit when a room is half-filled.

youdao

在开始之前，我在教室里随机选择了几张课桌--参照教室半满时人们通常选择的位置--在上面放上了一共5张20美元钞票。

Before the session began, I placed five $20 bills on random desks throughout the classroom--based on where people typically sit when a room is half-filled.

youdao