1. (水果、谷物等)成熟的
    Ripe fruit or grain is fully grown and ready to eat.

    e.g. Always choose firm, but ripe fruit.
           一定要挑选硬实但已成熟的水果。
    e.g. ...fields of ripe wheat.
           成熟的麦田

2. (时机)成熟的，适宜的
    If a situation is ripe for a particular development or event, you mean that development or event is likely to happen soon.

ripe

    e.g. Conditions were ripe for an outbreak of cholera...
           霍乱即将暴发。
    e.g. This society is ripe for change.
           发生社会变革的时机已经成熟。

3. (活到)高龄
    If someone lives to a ripe old age, they live until they are very old.

    e.g. He lived to the ripe old age of 95.
           他活到了95岁高龄。

4. 唾手可得;得到…易如反掌
    If something is ripe for picking or ripe for plucking, it will be very easy to obtain.

    e.g. Haig's message was that victory was ripe for picking.
           黑格传达的意思是说胜利唾手可得。

5. 时机已经成熟
    If you say the time is ripe, you mean that a suitable time has arrived for something to be done.

    e.g. He told reporters that he thought the time was ripe for a normalisation of relations...
           他告诉记者他认为是时候恢复两国间正常关系。
    e.g. The British Foreign Office has decided the time is ripe to send its first female ambassador to the region.
           英国外交部作出决定现在可以向该地区派驻第一位女大使。