1、Hypothyroidism is a condition in which the thyroid gland doesn't produce enough thyroid hormone.
甲状腺功能减退是甲状腺不产生足够的甲状腺激素的状况。
2、The most common cause of hypothyroidism is an autoimmune disease called Hashimoto's thyroiditis.
甲状腺功能减退最常见的原因是一种自身免疫疾病，称为哈希莫托甲状腺炎。