Otters have benefited from cleaner rivers in Britain, following a ban on chemicals used in sheep dip in the late 1990s.
英国在20世纪90年代晚期对羊用防腐浸液中的化学物质颁布禁令，河水变清，水獭因而从中受益。
Otters have benefited from cleaner rivers in Britain, following a ban on chemicals used in sheep dip in the late 1990s.
英国在20世纪90年代晚期对羊用防腐浸液中的化学物质颁布禁令，河水变清，水獭因而从中受益。
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