Does the subject want to ask, "What is the reason why the coffee beans of the wild pigeon brand have no original flavor after being put for one month?" The reasons are: oxidation and humidity.

1. oxidation: oil and aroma in coffee beans are easily oxidized. Exposure to air for a long time will lead to deterioration of oil and loss of aroma, thus making coffee beans lose their original flavor.

2. Humidity: Coffee beans easily absorb moisture in the air, and storage in a humid environment will lead to deterioration of coffee beans and affect the flavor.