慢速英语:专家称湄公河新的天蓝色可能是令人担忧的迹象

音频下载[点击右键另存为]

sediment – n. materials that collect at the bottom of a liquid

erosion – n. when parts of something or damaged or removed by the sea, rain or wind

unleash – v. to suddenly cause a strong reaction

Co. – abbreviation short for the word company

Ltd. – abbreviation short for the word limited