Because people's concentration time is limited, it is impossible to maintain a high degree of concentration. Once the time is too long, it is easy to be distracted.
Because people's focus time is limited, it is not possible to maintain a high degree of concentration, once the time is too long, it is easy to be distracted.
Because people's concentration time is limited, it is impossible to maintain a high concentration all the time. Once the time is too long, it is easy to be distracted.