self-emptying hopper

例句：

1. 1. This self-emptying hopper is designed to automatically empty the contents when the container is opened.
   这个自空式料斗设计成当容器被打开时自动将内容物排出。
2. 2.The farmer used a self-emptying hopper to store his grain for the winter.
   农民使用一个自空式料斗来储存他的谷物过冬。
3. 3.The self-emptying hopper was an innovative solution that greatly improved the efficiency of the farm's operations.
   自空式料斗是一个创新的解决方案，大大提高了农场运营的效率。