Nitrates are chemicals that occur naturally in water and the soil.硝酸盐是水和土壤中自然存在的化学物质。Nitrates leach from the soil into rivers.硝酸盐由土壤渗入江河。Nitrates are used as preservatives in food manufacture...硝酸盐在食品加工业中被用作防腐剂。Springs a...
I know a wonderful restaurant where we can have lunch next week.我知道一家很不错的餐厅，下周我们可以去那里吃午饭。I have started planning out what I shall be doing next week.我已开始详细安排下周要干的事儿了。All those invited to next week'speace conference ...