It's important to eat produce of various colors because each fruit or vegetable offers a different nutrient - think of it as nutritional cross-training.
吃各种颜色食物是很重要的,因为每种水果或蔬菜提供的营养不同——把这当成营养的交叉训练。
The genealogy of the H1N1 virus family would explain why exposure to a swine lineage via the 1976 vaccine or to older human lineages offers cross-protection against the new strain.
H1N1病毒的家族谱系能够解释,为什么注射过1976年疫苗或者接触过较早人类流感病毒会对新病毒起到交叉预防作用。
No ranking of high schools is perfect, and this one offers a cross-section, rather than an exhaustive appraisal, of college admissions.
没有高中的排名上完美的,这只是关于入学情况的一瞥,而不是详尽的评价。
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