1. He chopped a branch off that tree yesterday. 他昨天从那棵树上砍下一根树枝。
2. They chopped down a tree to bridge the stream. 他们砍下一棵树在小溪上架起一座“桥”。
3. But trees, once planted, can die and decay or be chopped down for firewood, releasing the carbon they stored back into the atmosphere. 但是树木一旦种植可能会死亡,腐烂或是遭到为薪砍伐,从而向大气释放出原先贮存的碳。