水泥工人也提供古人挖井的智慧，原来建好后还要撒放石灰。

Construction workers also provided the wisdom of the ancestors: sprinkling lime into the well.

youdao

水泥工人也提供古人挖井的智慧，原来建好后还要撒放石灰。

Construction workers also provided the wisdom of the ancestors: sprinkling lime into the well.

youdao