漂亮的树叶明暗相间。
轴突内可见丝状的神经原纤维及线粒体，轴突外包有髓鞘，为明暗相间的同心圆板层结构。
Filamentous neurofibrils and mitochondria were observed in axons. Axons were enveloped by myelin sheath, presented alternately dark and bright lamellae concentric configuration.
星云由发光的气体组成，其间夹杂暗色的尘埃。这种明暗相间的组成标示了银河系缓慢的漩涡运动。
Clouds of stars are glowing gas, with patches of darkening dust, mark the slow-changing spiral patterns of the Galaxy disk.
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