Scientists are producing carrots and celery that can hold their crispness so much longer than conventional varieties that they might be sold as prepackaged snacks.

• 科学家们正在生产能够长时间保持鲜脆的胡萝卜和芹菜，保鲜的时间远远超过普通的品种，所以可以按重量预先分份包装出售。