a sight for sore eyes 心旷神怡；赏心悦目

【例句】
After the long, dusty hike, the lake and its cool water was a sight for sore eyes.
经过风尘仆仆的跋涉之后，看到清澈的湖水真让人感到心旷神怡。

Look, the guy walking to us is Robert. He's such a sight for sore eyes.
看，向走的罗伯特，看到他总是让人高兴。