Drones Help Mountains

Last year, big typhoons came to Hualien. The heavy rain caused landslides. Rocks and dirt fell down the mountains. The landslides took away many trees and other plants. This is bad for the mountains. Trees and plants help hold dirt. They keep the mountains strong. 去年，一場很大颱風在花蓮造成土石流，帶走很多樹木和植物。山坡上的樹木和植物對水土保持很重要，要怎麼辦呢? Click HERE for the full transcript!