In male animals, Carnitine deficiency can result in infertility.
在雄性动物，左旋肉碱缺乏症可导致不育。
He didn't speculate as to which is the more likely culprit, but said that many things, such as gene mutations, could cause defects in methylation that might result in infertility.
至于哪个更可能是原因他并没能做出预测，但是他说许多东西如基因突变也能导致甲基化的缺陷，这也可能导致不育。
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。
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