They are planting trees on the mountain.
他们在山上植树。
Those trees on the mountain are often cut down because they can be used as good material for building and firewood.
山上的树木经常被人砍伐,原因是它们可以供做建材,也可以当柴烧。
Look! The people are planting trees on the mountain, some are digging the holes, some are carrying the water, others are watering the trees.
看!人们正在山上种树,一些人在挖坑,一些人在担水,其他人在浇树。
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