swelling clay

例句：

1. 1. The soil is so rich in minerals that it can form swelling clay when exposed to sunlight.
   土壤富含矿物质，暴露在阳光下时可以形成膨胀的黏土。
2. 2.The ancient pottery was made from swelling clay, which has been passed down through generations.
   古代陶器是用膨胀黏土制成的，这种黏土已经传承了几个世纪。
3. 3. The farmer used swelling clay to make his own fertilizer, which helped his crops grow better.
   农民用膨胀黏土制作自己的肥料，这有助于他的庄稼生长得更好。