cornerstone
['kɔrnɚ`ston]
n. 奠石, 础

1. Hard work is the cornerstone of success.
   努首素。
2. is a vital cornerstone of global strategic security.
   球战略石.
3. Accurate diagnosis is the cornerstone of medical care.
   正确诊医疗照护础。

cornerstone
[ noun ]

1. the fundamental assumptions from which something is begun or developed or calculated or explained

<noun.cognition>
the whole argument rested on a basis of conjecture

2. a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies

<noun.artifact>

3. a stone at the outer corner of two intersecting masonry walls

<noun.artifact>