### 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: March to June each year is the time for olive trees to blossom and bear fruit; July to October each year is the time for olive fruits to grow and mature, and the fruits change from green, red, purple and then dark.
### Errors: There is a minor error at "fruits". There is a minor error at "grow". There is a minor error at "fruits change". There is a minor error at "then dark".

### 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.