You can see most of London on a clear day.

在晴天你可以看到大部分的伦敦。

On a clear day, you can see a long way from the top of the mountain.

天气晴朗时，你可以从山顶看到很远。

On a clear day, the view from the top of the mountain is amazing.

在晴朗的日子里，从山顶上看去，景色令人惊叹。

Eg. It was a bright and clear day.

那是一个晴朗明媚的日子。

The moths fly with a clear day-night rhythm.

飞翔活动有明显的昼夜节律。

If you can meet a clear day, it is a magic too.

如果你能遇到一个晴天的话，那也是一件神奇的事。

It was a fine and clear day towards the end of summer.

这是夏末一个晴空万里的日子.

It was a very clear day and we could see a long way.

天气十分睛朗，我们可以看得很远。

It's easy to distinguish the distant objects on the clear day.

在晴朗的日子很容易看清远处的物体。

On a bright and clear day a 15 - cm helio can be seen at 50 km .

在明朗的晴天，15厘米大小的回照光在50公里处能看到。