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可可电台，每期节目一话题，让英语磨练耳朵的同时学到更多有益的小知识，丰富知识的同时受益于生活。
Happiness hacks
快乐秘诀
Load up on leafy greens
多吃绿叶蔬菜
Dark, leafy greens such as spinach and kale are rich in folate, providing 33% of the recommended daily allowance (RDA).
深色绿叶蔬菜，如菠菜和甘蓝富含叶酸，提供了每日推荐摄入量(RDA)的33%。
This nutrient is linked to a decrease in negative moods and depression because it helps produce dopamine in the brain.
这种营养与消极情绪和抑郁的减少有关，因为它有助于大脑产生多巴胺。
One 2012 study found that middle-aged people who consumed the most folate had a lower risk of depression symptoms than those who ate the least.
2012年的一项研究发现，摄入最多叶酸的中年人比摄入最少叶酸的中年人患抑郁症的风险更低。
【知识点讲解】
rich in 富有； 富含
例句：
This product is rich in herbal essence.
富含纯净的植物精华。
The beds, rich in organic material from which hydrocarbons originated, are called source beds.
富含能够产生碳氢化合物的有机物质的地层叫做生油层。
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