yuán / dīng / zài / huā / tán / shàng / pū / le / yì / céng / fù / gài / wù / yǐ / bǎo / chí / tǔ / rǎng / shī / rùn

园丁在花坛上铺了一层覆盖物，以保持土壤湿润。

The gardener spread a layer of mulch over the flower bed to keep the soil moist.