名詞 corner stone:

1. the fundamental assumptions from which something is begun or developed or calculated or explained
   同義詞：basis, base, foundation, fundament, groundwork, cornerstone
2. a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
   同義詞：cornerstone
3. a stone at the outer corner of two intersecting masonry walls
   同義詞：cornerstone

1. The root of the big tree trends to edge away the corner stone.
   這棵大樹的根可能會把墻角石頂走。