1.adequate 常含有“充分但刚好足够之程度”的意思

That's not an adequate explanation.
这并不足以说明问题.

2.enough 指数量、份量或程度能满足一种愿望，特别是物质上的需要

Do you have enough time to finish the paper?
你有足够的时间写完论文吗？


3.sufficient 指数量上尤指程度上多能满足或叨叨某种特殊需要，

The money I have saved is sufficient for buying a car.
我所存的钱足以买一辆汽车。


4.all the same 都一样

Whether they win or lose is all the same to me.
他们是赢是输於我都一样.


5.in all 总共

We numbered 20 (ie There were 20 of us) in all.
我们共计20人.

6.not at all 一点也不

I am not at all satisfied with the present situation.
我对现状根本不满意。