A 21-year-old student in India named Bittu Tabahi cleaned up a dirty river all by himself. The river was full of trash, but he wanted to make it clean again.
all by himself= 完全靠自己、獨自一人
At first, many people laughed at him. Cleaning the river was dangerous for his health, and he did not have much money or special tools. Still, he kept working every day to remove the garbage.
kept working= 持續工作不間斷
His hard work completely changed the river. Now, the waterway is clean, and his efforts have moved the government to take action.
take action= 採取行動以解決問題