be short for 和 be short of之间的区别是什么?

be short for
是…的简称；是…的缩写

be short of

缺乏……；离……不远；缺少、不足

例句：
1. The vehicle Antilock Braking System (be short for ABS) has been widely appliedon the vehicles, in order to improve the safety.
为提高汽车行驶安全性，制动防抱死系统（简称ABS）在汽车上得到了广泛应用。

2. IF ANY company captured the optimism (and possibly hype) emanating from China, it was BYD, whose three letters are said to be short for “build your dreams”.
如果有公司拥有中国的乐观主义精神（或许是天花乱坠的宣传），那就是比亚迪（BYD），这三个字母就是“塑造梦想”(build your dreams)的缩写。

3. If you are versatile, then you'll never be short of conversational topics.
如果你有多种学问，那么你谈话时就不会缺少话题了。

两个例子来说明其用法
We are short of hands now. 我们现在缺少人手。
Phone is short for telephone. Phone 是telephone的缩写。

be short of 未达到；缺少；短少； 在...附近
be short for ......的简称