Your body needs to experience all three steps of sleep—light sleep, dream, and deep sleep—to fully repair itself.
你的身体需要经历睡眠的三个步骤——浅睡眠、做梦和深睡眠——从而进行完全的自我修复。
2
They received a shot of genes near their retinal cells to repair their light receptors.
他们接受了视网膜细胞附近的基因注射，以帮助修补他们的光受体。
3
A new polymer material that can repeatedly heal itself at room temperature when exposed to ultraviolet light presents the tantalizing possibility of products that can repair themselves when damaged.