Wildlife official are celebrating the sighting of a beaver in the Detroit River for the first time in at least 75 years, signaling that efforts to clean up the waterway are paying off.

• 至少75年，，海狸没有出现在底特律河，动物保护组织的官员们如今庆祝海狸的重现身，旨在表明他们清除河道的工作取得了成效。