The children pretend not to know how to get on the sawhorse so the devil's wife demonstrates.

孩子假装不懂怎么上架，魔鬼的妻子来做示范。

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So the next day, he dictated a message that his mother wrote on a large poster-board. He signed it, stapled it to a sawhorse and put it in the front yard.

所以第二天，他刻意留下说了一个讯息，由妈妈帮他写在一个很大的板子上，他在上面签了名，把这板子钉在锯木架上，然后把他立在前院。

youdao

So the next day, he dictated a message that his mother wrote on a large poster-board. He signed it, stapled it to a sawhorse and put it in the front yard.

所以第二天，他刻意留下说了一个讯息，由妈妈帮他写在一个很大的板子上，他在上面签了名，把这板子钉在锯木架上，然后把他立在前院。

youdao