缺乏 and 差
缺乏 means shortage, We use 缺乏 when we talk about lack of something, there is not enough of it or there is none at all. Specially used for any resource while 差 also used for shortage but it express quantity number of something which is shortage .
EXAMPLE -
缺乏
1. 他缺乏信心.
。
tā quēfá xìnxīn.
He lacks confidence.
2. 由于缺乏经费.
yóuyú quēfá jīngfèi.
Due to lack of funds
3. 沙漠缺乏水。
shāmò quēfá shuĭ.
A desert lacks water.
差
1. 还差三个螺丝.
Hái chà sān gè luósī.
Still short three screw.
2. 我要买一台iphone 但是还差3000 Lúbǐ.
Wǒ yāomǎi yī tái iphone dànshì hái chà 3000 .
I want to buy iPhone but still short of 3000 rs.
3. 二月时候差两天.
Èr yuè shíhòu chà liǎng tiān.
There is short of two days in February month.