向日葵花粉颗粒 (IMAGE) Proceedings of the National Academy of Sciences Caption 近距离拍摄的向日葵花粉颗粒。 Credit 图片由Nam-Joon Cho提供。 Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.