优生用英语短语怎么说

优生 (yōu shēng) is a term in Chinese that means "eugenic reproduction," or the practice of selecting or manipulating genetic traits in order to produce offspring with desired characteristics. In English, this concept is often referred to as "eugenics" or "positive eugenics."
For example, you could say:
"Eugenics is the study of how to improve the human race through selective breeding."
"Positive eugenics refers to the use of genetics to promote the health and well-being of future generations."
It's important to note that the concept of eugenics has a controversial history, and many people believe that it has been used to justify harmful practices such as forced sterilization and discrimination against certain groups of people. Today, many scientists and ethicists caution against using genetics to try to control the characteristics of future generations, arguing that it could lead to unintended consequences and further inequalities.