里面黑板上写得肯定是德文, Amish 祖先就是讲德语的, 查了下 Wikipedia...

In the early 18th century, many Amish, and Mennonites, immigrated to Pennsylvania for a variety of reasons. Today, the Old Order Amish, the New Order Amish, and the Old Beachy Amish continue to speak Pennsylvania German, also known as "Pennsylvania Dutch", although two different Alemannic dialects are used by Old Order Amish in Adams and Allen counties in Indiana