流入湖中的泉水和河水携带了溶于水的硝酸盐和磷酸盐。Springs and rivers that drain into lakes carry dissolved nitrates and phosphates.硝酸盐是水和土壤中自然存在的化学物质。Nitrates are chemicals that occur naturally in water and the soil.硝酸盐由土壤渗入江河。Nitrates leach fro...
身为弗洛斯特指定的传记撰写人, 我将这事记在心上.As Frost's official biographer, I mentally filed this information.他的讲稿撰写人技巧娴熟,而他每每讲到精彩之处也是板着一副扑克脸.His speech writers are skilful and he delivers punch lines with a certain deadpan panache.杜林...