1. Competition between bidders for this valuable painting has been keen.
    拍卖时各出价人对这幅名画竞争很激烈.

2. But a keen appetite for pleasure even in its simplest and most modest forms.
    而且还带来了寻找乐趣的强烈欲望，那怕是最简单的、最低等的乐趣。

3. Building garages and making furniture. Some really keen enthusiasts go so far as to build their own computers.
    有些热衷于自己动手的人甚至自己组装电脑。

4. I look forward to your visit with keen anticipation.
    我殷切期望你的来访。

5. I keen appetite for pleasure even in its simplest and most modest forms.
    我有一种渴望消遣的强烈欲望，哪怕是一种最简单最朴实的方式。