求翻译:The professor marched into the lecture hall, placed upon his desk a large

jar filled with dried beans（豆）, and invited the students to guess how many  beans  the  jar  contained  .

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The professor marched into the lecture hall, placed upon his desk a large jar filled with dried beans, and invited the students to guess how many beans the jar contained
参考译文如下。
教授走入授课厅（大教室），把一个装满干豆的大罐子放在他的桌子上，并请学生们猜猜罐子里有多少豆子。

教授走进演讲室，把他的东西放在讲台上。 再看看别人怎么说的。