采取相应的优生措施是做到优生的基本条件。
Adopting correspond of healthy propagation measure is the basic condition to healthy propagation.
影响优生的环境因素包括物理、化学、药物、生物等。
The environmental factors that have influences on eugenics including physics, chemistry, medicine and biography.
本文谈了优生的消极心理障碍的病因、症状、医治和预防四个问题，给出了调理和医治优生的心理疾病的四种方法。
This paper expounds the causes, symptoms, cure, prevention of top students psychological barrier and puts forward four methods to nurse and cure them.
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