张元勋，一位中国科学院专家，告诉环球时报，解决这一问题需要时间，并呼吁更严格的执法和更严厉的惩罚措施。
Zhang Yuanxun , an expert at the Chinese Academy of Sciences , told the Global Times that it took time to tackle the problem , and has called for stricter law enforcement and harsher punishments .
张元勋