与此相反的是，幼龄儿童没有与H1N1的既往接触史，故而免疫系统无法及时作出反应。
The very young children, in contrast, represent the responses of immune systems that have no past history with H1N1.
在幼龄教育中，左撇子儿童学习起来很艰难，他们的书写一团糟。
In early-year education, left-handed children are struggling and making a mess of their handwriting.
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