They have hereditary forms of slavery in India.

“自古以来，印度就是个奴隶制国家。

This is usually a result of the aging process in the heart, and happens most often in the elderly, although some hereditary forms have been identified and can happen in younger people.

这种疾病通常是心脏随年龄增长逐渐老化的结果，主要在老年群体中发病，但目前已发现该病与遗传因素有关，在青壮年中也可发病。