On a clear day you can see France.

天气晴朗时你可以看见法国。

《牛津词典》

On a clear day you can see the coast.

天晴时你能看见海岸。

《柯林斯英汉双解大词典》

On a clear day you can see for miles from here.

在晴天，你从这儿能看出去很远。

《牛津词典》

It can do this between sunrise and noon on a clear day with an average outside temperature of thirty-two degrees Celsius.

VOA: special.2009.04.20

to get a view all over the city, on a clear day, of course.

俯瞰整个城市，当然这要在一个晴朗的日子。

神奇的博物馆 - SpeakingMax英语口语达人

This was clear on Wednesday hardline separatists called a general strike to protest the Indian leader's two day visit to the region.

VOA: standard.2009.10.28

On a clear day, you might even be able to make out the Welsh coast.

BBC: Day trips from Dublin

The view, on a clear day, is of the Columbia Icefield 75km to the south.

BBC: The natural wonders of Banff and Jasper National Parks

On a clear day you can see to the Lizard Peninsula more than 60 miles away.

BBC: Historic Mount Edgcumbe's uncertain future