But research shows that most infertility is the result of physical problems in a man's or woman's reproductive system, and psychological factors are rarely the primary cause.
但研究表明，大部分不孕症的原因是由男方或女方生殖系统的病变所引起的，心理因素很少成为原发性病因。
2
AIM: To investigate the psychological health status of children in primary school.
目的：了解小学儿童的心理健康状况。
3
This dissertation studied on the primarypsychological characters and special psychological characteristics of equestrian athletes from two facets of theory and practice.