The atmosphere consist of more than 70 % of nitrogen.大气中含有70%以上的氮气.Every tonne of coal contains, on average, 30 kilograms of nitrogen.每吨煤平均含30公斤氮.The plant requires nitrogen in order to make proteins.植物需要氮以便制造蛋白质....
我很喜欢纺纱.Spinning is one of my hobbies.她们纺纱、织布、煮饭以及料理家务。They would spin and weave cloth, cook and attend to the domestic side of life.她仍然纺纱为家人织毛线衫。She still spins the yarn and knits sweaters for her family....