A embankment of a thousand miles is lost to an ant nest; a slightest loss is the difference of a thousand miles.

1. A dike that is thousands of miles long, thanks to an ant nest: dike: embankment, dam; collapse: collapse, collapse; ant nest: ant hole, a thousand-mile long embankment collapsed because of a small ant hole, It is a metaphor that big disasters or losses are often caused gradually by small hidden dangers.

2. A slight miss is a thousand miles away: miss, difference: mistake, mistake; millimeter: a small unit of weight and length, ten centimeters is one centimeter. A small mistake at the beginning will lead to a huge mistake. It is emphasized that no small mistakes can be made.