The level of TN (1.88mg/L-3.65mg/L), TP (0.12mg/L-0.51mg/L) and COD (16mg/L-26mg/L) in the trial rice fields increased steadily during the cultural time, and lower than in ponds.是什么意思_The level of TN (1.88mg/L-3.65mg/L), TP (0.12mg/L-0.51mg/L) and COD (16mg/L-26mg/L) in the trial rice fields increased steadily during the cultural time, and lower than in ponds.在线翻译_英语_读音_用法_例句