丹尼·斯林德赛仍然记得四十年前的那一天，他父亲，一位爱荷华州农民，第一次在家160英亩地中使用氮肥。
Dennis Lindsay still recalls the day four decades ago when his father, an Iowa farmer, began using nitrogen fertilizer on the family's 160 acres.
但科尔-林德赛表示，塞尔维亚人非常矛盾，因为他们知道，他们国家的未来已经成为欧盟的一部分。
But Mr. Ker-Lindsay says Serbs are conflicted because they understand that their country's future has to be a part of Europe.
“这足以说明他们有可能在向那里进军。”TNC五大湖水生入侵物种项目主管林赛。查德顿说。
"That's enough to show that they're likely making their way into the lakes," says Lindsay Chadderton, director of TNC's Great lakes Aquatic Invasive Species program.
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