spear grass

例句：

1. 1.The grass was tall and green, providing shade for the animals.
   草很高很绿，为动物提供了荫凉。
2. 2.The farmer used a spear to plow the field.
   农民用一根长矛来翻耕田地。
3. 3. The spear grass is often used as a natural remedy for digestive issues.
   刺草经常被用作治疗消化问题的天然疗法。