sundial

In the center of the garden, an ancient stone sundial still correctly tells the time.

(Chinese) 在花园中央，一个古老的石质日晷仍然能正确地指示时间。

A sundial is useless on a cloudy day because it requires direct sunlight.

(Chinese) 阴天时日晷是没用的，因为它需要直接的阳光。