[译] 保持头发魅力的一个重要因素是全身的健康。
[误] The one most important factor in keeping the hairs attractive is good general health.
[正] The one most important factor in keeping the hair attractive is good general health.
[注] hair 一般不用复数，如：A severe infection such as scarlet fever may cause the loss of hair. 严重感染（如猩红热）可造成脱发。如果说“几根头发”，亦可用复数，如：I found a hair in the soup. 我发现汤里有一根头发。/There were two grey hairs on your coat collar. 你的衣领上有两根白头发。
