First they dug trenches around the fields to siphon off the water, but the soil beneath was still too wet to grow crops, so they added these underground tubes with holes in the top.

首先，他们在田地周围挖沟来吸走水分，但是下面的土壤仍然太湿，不能种植庄稼，所以他们在上面挖了一些洞，把这些地下管道加了进去。