扎克知道紫心勋章的意义——他作为一名士兵曾在战争中赢得过一枚。
Zac knows the meaning of a Purple Heart — he earned one himself in a war as a soldier.
图表中，绿条代表的是以菜单方式回答的答案的错误率(菜单组)，紫条显示的是两组以键入方式回答的答案的错误率。
On this graph, the green bars represent the questions that could be answered with menus (for the "menu" group). The purple bars show the error rate on questions that both groups had to type.
然而，在研究开始时分发的表格中高度认同紫锥菊疗效、并在研究中得到安慰剂的那组病人感冒病程最短。
However, a subgroup who rated echinacea's effectiveness highly on a form at the start of the study — and were given a placebo during the study — had the shortest duration colds.
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