automatic knapsack sprayer

例句：

1. 1. The automatic sprinkler system is designed to prevent water damage.
   自动洒水系统设计用来防止水损害。
2. 2.The machine is automatic and can be operated by just pressing a button.
   这台机器是自动的，只需按一个按钮就能操作。
3. 3.The automatic transmission allows for smoother driving without the need for manual shifting.
   自动变速箱让驾驶更加平稳，无需手动换档。