When working on your homework, you might sometimes find that your smartphone is distracting (使分心) you. An app called Forest can help you stay focused. When you set a new task in the app and set a certain amount of time to finish it, a tree seed will be “planted” in the app. If you keep finishing your task, the seed will grow into a tree. But if you close the app and play with your phone instead, the tree will wither (枯萎) and even die. Once you finish the task, your tree will be “planted” in the app. Gradually, you will have a forest! You can share your achievements (成就) with your friends and try to “plant” different kinds of trees.