a bit of表示一点儿，略微，有点儿，修饰名词，通常用于修饰不可数名词。等于a little，后接不可数名词。

1、a bit of 修饰名词，通常用于修饰不可数名词。

午饭只能吃剩下的一点食品了。

2、a bit of的另一种形式是bits of

Besides this,he used part of an old army wireless set,and some bits of wood.

除此之外,他还利用了一部分旧的军用无线电发报机的一部分零件和一些木片。

3、a bit (of)有点；稍微

I'm a little bit tired.Let's take a short rest.

我有点累了。让我们休息一会儿。

I'm a bit tired tonight.

今晚我有点疲倦。

The painting on the wall is a bit crooked.

墙上的油画有些歪。

Don't believe all he says — he's a bit of a boaster.

别全信他说的,他有点自吹自擂。

We were very sorry to see that the houses of some school teachers were a bit of a hole.

看到有些小学教师的住房小得象个窝,我们很难过。

4、a bit (of) 一点儿也（不）

I'm not a bit tired now.

我现在一点儿也不累。

Really,David is not a bit like his brother as far as generosity is concerned.

的确,就慷慨大方这一点来说,大卫确实一点也不像他哥哥。

5、a little = a bit of, 后接不可数名词； a little = a bit = a little bit = kind of, 后接形容词，意为“有点儿”。