4. “Their capacity for tolerating stress may even be greater than men's,” she observed, "It's just that they're dealing with so many more things that they become worn out from it more visibly and sooner."

【分析】并列复合句。引号中的两个句子可视为两个并列的分句，she observes 为插入语。在第二个分句中，第一个 that 引导表语从句，it's just that 相当于 it's just because；第二个 that 引导结果状语从句。

【译文】胡叶达医生说：“她们承受压力的能力甚至可能比男性更强。但只是因为她们要处理的事情太多以至于疲劳得更快更明显。”

5. I think that the kinds of things that women are exposed to tend to be in more of chronic or repeated nature.

【分析】多重复合句。第一个 that 引导宾语从句，其中包含 that 引导的定语从句，定语从句修饰 things。

【译文】我认为女性所必须面临的压力一般都具有长期性和反复性特征。