季节H1N1感染可以活化另一部分免疫系统，称为细胞介导免疫性，它可以没有预先感染就能限制疾病的严重性。
Seasonal H1N1 infection may have primed another part of the immune system, called cell-mediated immunity, which may not prevent infection but limits the severity of the disease .
预先建立有关时间限制的边界，要远胜于尝试处理所有事情却谁也无法满足。
It's far better to establish boundaries up front concerning your time limitations than to try to handle everything and please no one.
直到当前存储区域达到预先确定的大小限制时，才使用下一个可用的存储区域。
The next available storage area is not used until the current one has reached a predetermined size limit.
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