1. 只不过;仅仅
    You use mere to emphasize how unimportant or inadequate something is, in comparison to the general situation you are describing.

    e.g. ...successful exhibitions which go beyond mere success...
           不仅仅是成功而是大获成功的展览
    e.g. There is more to good health than the mere absence of disease...
           身体健康不仅仅指不生病，还包括更多。

2. 极小的，微不足道的，单单(表示虽小却有重要影响)
    You use mere to indicate that a quality or action that is usually unimportant has a very important or strong effect.

    e.g. The mere mention of food had triggered off hunger pangs...
           单单提到食物就引起了阵阵饥饿感。
    e.g. Whenever there was a gap in the traffic the merest pressure on the accelerator was enough to close it...
           每当车流里出现了一点儿空距，只要稍稍一踩油门，空距就没有了。

3. 只不过，仅仅(用于强调数量之小)
    You use mere to emphasize how small a particular amount or number is.

    e.g. Sixty per cent of teachers are women, but a mere 5 percent of women are heads and deputies...
           有60%的教师是女性，但是担任校长和副校长的女性仅占5%。
    e.g. Tickets are a mere £7.50 at the door...
           门口买票只要7.5英镑。