It was a plain, grey stone house.

这是一座简朴的灰色石头房子。

《柯林斯英汉双解大词典》

Bael, wood apple or stone apple is a species native to India, but found throughout Southeast Asia. Bael is a smooth fruit with a woody peel that is colored yellow, green or grey.

印度枳又称木苹果或石苹果，树种原产于印度，但现已经遍布整个东南亚。

youdao

They banded the Berlin Wall in light and dark grey stone.

他们用淡灰色和深灰色的石头砌成了柏林墙。

youdao

The lines of grey stone, the birdsong, the stillness, the lengthening shadows were still a refuge.

BBC: Following the Silk Road to the end of China

We soon passed a damaged, burned-out, grey stone shrine, the cause of much tension even today.

BBC: Part II: The road to Bethlehem

Carved in grey stone, the great Chinese traveller looked like the kind of chap who would have difficulty running to catch a bus.

BBC: Following the Silk Road to the end of China