### Chinese: 每年的3至6月，是油橄榄树开花坐果的时间，7至10月果实开始发育并且成熟，果实从绿色过渡到红色，紫色，最后变黑。
### English: From March to June every year, it is the time for olive trees to bloom and set fruits. From July to October, the fruits begin to develop and mature, and the fruits transition from green to red, purple, and finally turn black.
### Errors: There is a minor error of problems with grammar, other than orthography at "it is the time for olive trees to bloom and set fruits". There is a minor error of incorrect translation includes information not present in the correct translation at "and finally turn black".

### Improved English: March to June each year is the time for olive trees to blossom and bear fruit, and from July to October, the fruit begins to develop and ripen, and the color of fruit will transition from green to red, purple and finally black.