addition of clay的用法和样例：
- The addition of clay gives a higher density, MOR, and strength.
- The results show that the addition of clay to the coal gangue in certain proportion can increase the content of fine particles as well as intensify the discontinuous distribution of particle groups.
- The artist started with a big lump of clay.
- The president had feet of clay: he drank a lot.
- A sun-dried, unburned brick of clay and straw.