He says there is a direct causal relationship between a person getting fat and being followed in weight gain by a friend.
他认为当某人的朋友体重增加时，其自身随之也变胖，这其间存在直接的因果联系。
However, there is insufficient evidence at present to support the hypothesis that depression has a direct causal relationship with subsequent dementia.
不过，目前尚无足够的证据支持抑郁与随后的痴呆有直接因果关系的假设。
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