庚(gēng)
Origin:
“庚“的本义是“脱谷的农具”。字形是一个架状物，中间有一把上端开叉的打谷器。后多用作天干名。
This character originally meant “threshing tools.” It looks like the frame of a threshing device, the upper part of which was open. Later, it was used as a name of the Heavenly Stems.
Meaning:
the seventh of the Ten Heavenly Stems; age
Words:
贵庚(guìgēng): age
庚齿(gēngchǐ): age
庚伏(gēngfú): dog day summer
Sentences:
1、Qǐngwèn nín guìgēng?
请问您贵庚？
请问您贵庚？
May I ask how old are you?
2、Gēngfú shì yìnián zhōng zuìrè de shíhòu.
庚伏是一年中最热的时候。
庚伏是一年中最热的时候。
The dog days are the hottest time of the year.
