1. 足够;充足
    If you say that something will suffice, you mean it will be enough to achieve a purpose or to fulfil a need.

    e.g. A cover letter should never exceed one page; often a far shorter letter will suffice.
           附信不应超过一页，通常来说，一封相对非常简短的信就足够了。

2. (用于句首)无须多说，只需说…就够了
    Suffice it to say or suffice to say is used at the beginning of a statement to indicate that what you are saying is obvious, or that you will only give a short explanation.

    e.g. Suffice it to say that afterwards we never met again...
           简单地说，此后我们再也没有见过面。
    e.g. Suffice to say, it was more than a couple of years ago!
           我只想说，那是几年前的事了！