universal acquired melanosis

例句：

1. 1. The universaltruth is that every child needs love and care.
   普遍真理是，每个孩子都需要爱和关怀。
2. 2. This universal law applies to all species of plants.
   这一普遍法则适用于所有植物物种。
3. 3. The universal language of the universe is not yet understood.
   宇宙中普遍的语言尚未被理解。