“差的营养会伤害免疫系统，”英国营养基金会营养科学家安娜·丹尼说。
"Poor nutrition can compromise the immune system," says Anna Denny, nutrition scientist at the British nutrition Foundation.
怀勒说，科学家尚未对这种山药的营养成分及食用益处进行研究。
Wheeler said that scientists have not yet studied the yam's nutritional value to see what benefits the plant offers as a food crop.
科学家们仍在研究营养成份与免疫系统相互作用的复杂方式。
Scientists are still studying all the complex ways in which nutrients interact with the immune system.
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