The key is convenience. The ignored factor is nutrition.

人们关注是快餐方便性，却忽略了它缺乏营养价值事实。

With eDNA, they also found that less nutritious grasses colonized the Arctic steppe during the last ice age, potentially contributing to the mammoth decline.

境 DNA，研究者还发现那些缺乏营养价值草在最后一个冰河期内于北极草原上肆意生长，极可能加速了长毛象种群数少。

It is like the immune system of the body, which under stress or through lack of nutrition or exercise can be weakened, but which never leaves us.

这就像身体免疫系统，在有压力候，或缺乏营养和锻炼候，免疫系统才会弱，但不会离我们而去。

These cafeterias, once known as " senior canteens, " were originally established to provide healthy meals at affordable prices to older folks who might not be getting enough nutrition at home.

这些自助餐厅曾被称为“老年食堂”，最初是为了缺乏营养老年人可以吃上健康、便宜餐食而成立。