库德拉检测了城市污水处理工厂的样本，并没有发现高难度的尿素。但是曽有化粪池泄露污染切萨皮克湾和墨西哥湾。
Sewage-treatment plants tested as part of Kudela's study did not discharge much urea, but leaky septic tanks have been known to dump urea into the Chesapeake Bay and the Gulf of Mexico.
库德拉检测了城市污水处理工厂的样本，并没有发现高难度的尿素。但是曽有化粪池泄露污染切萨皮克湾和墨西哥湾。
Sewage-treatment plants tested as part of Kudela's study did not discharge much urea, but leaky septic tanks have been known to dump urea into the Chesapeake Bay and the Gulf of Mexico.
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