请问 海天一线 英语怎么说?谢谢

The sea lined into the sky.

The sea and the sky merged into the horizon.
其实就是大海和蓝天连成一片，一望无垠，广阔之貌，可以简单地说：
The boundless sea and sky
or
The (vast) horizon of sea and sky

The sea and the sky linked together in a line.

The sea and the sky are almost linked together.

The sea lined into the sky

the sky meets the sea