慢速英语:哪种钻石对环境更好?

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secor – n. an area or part that is different from others

ethical – adj. following accepted rules of behavior: morally right and good

conservation - n. the careful use of natural resources (such as trees and oil) to prevent them from being lost or wasted

resource – n. materials required for a person or organization to operate normally

renewable – adj. replaced by natural processes; able to be replaced by nature