Their keen vision means they can spot a ball of fish a mile away. 敏锐的视力 令其能在1.6公里外发现鱼群
An adult female keeps a keen watch. 一只成年雌性在警惕地观察
she must run the gauntlet of defensive mothers keen to protect their young. 它必须穿过一长排保护心极强的母龙
Perhaps he's just a little too keen. 可能他有点太急切了
She's keen to join in the game but she's the youngest and, 她很想加入游戏 但是由于年纪最小
and the bears are keen to shed their thick winter coats. 灰熊急切地想脱下它们厚重的冬衣