干 gān
Origin:

甲骨文中“干”是用树枝制成的“叉”状武器，用它可以叉住野兽或者敌人的颈部，所以“干”的本义是一种原始武器，简化字以“干”代替“幹”、“乾”。
On oracle bones inscriptions, “干” was in the shape of a weapon made from a tree branch. People can use such weapons to catch wild beasts or stab an enemy in the neck; thus, the character’s original meaning was an aboriginal weapon. Simplified character uses the form “干” instead of “幹” or “乾.”

Meaning：

dry; waterless; empty; hollow;offend

Words：
干燥(gān zào): dry
干净(gān jìng): clean; tidy
干涉(gān shè): inference
干扰(gān rǎo): to disturb
若干(ruò gān): a certain number of

Sentences：

1、Shāmò lǐ de qìhòu hěn gàn zào.
沙漠里的气候很干燥。
The weather in the desert is very dry.

2、Nǐ zǒu ba, yǐ hòu zán men hù bù xiāng gàn.
你走吧，以后咱们互不相干。
You should just go. From now on, we have no relationship.

原文链接