婉儿xiaotu
夏天秋天冬天人们的活动People's activities in the summer autumn winter夏天秋天冬天人们的活动People's activities in the summer autumn winter
撒旦情人518
"Human activity"例句相比之下，人类活动燃烧煤、石油等所释放的二氧化碳要少一些。The amount of carbon dioxide released by human activities such as burning coal and oil is small in comparison
