keystones

n.

  • 柯林斯高阶英汉双解学习词典

1. N-COUNT 拱顶石 A keystone is a stone at the top of an arch, which keeps the other stones in place by its weight and position. 
2. N-COUNT (政策、体系或进程的)基础,主旨 A keystone of a policy, system, or process is an important part of it, which is the basis for later developments. 
  • Keeping inflation low is the keystone of their economic policy.

    将通货膨胀率保持在较低水平是他们经济政策的主旨。