Depression is an illness like heart disease or cancer.
抑郁是种病，就像是心脏病或癌症一样。
2
Serious medical conditions like heart disease, cancer, and HIV can contribute to depression, partly because of the physical weakness and stress they bring on.
严重的病情比如心脏病癌症和艾滋病可能导致抑郁症部分原因是它所带来的身体的虚弱和压力。
3
I know that some suspect aspartame, the sweetener used in the drink, has links to depression and cancer. But there's no concrete scientific proof.