Forest rangers can drop the sensors from aeroplanes to detect fires, showing their exact location and how fast and in what direction they are spreading.
护林员可以从飞机上扔下传感器来探测火情——准确的方位和扩散的速度、方向。
Forest rangers take down the DAMS, and the beavers rebuild them.
森林守护人员拆除了坝堤，而海狸们又把坝堤恢复起来。
Forest rangers take down the DAMS, and the beavers rebuild them.
森林守护人员拆除了坝堤，而海狸们又把坝堤恢复起来。
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