在第五级，你进行的是最优化。

At Level 5, you are optimizing.

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猪流感病毒在世卫组织的六个警戒级别的仍然在第五级，这意味着马上就要全球爆发。

The WHO's alert level for the virus remains at phase five of six, meaning a global outbreak is imminent.

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在第五级和第六级数学能力测验中主要是测量学生的数学概念、对问题的解题方式、数学运算和数学技巧。

The Mathematics test at Levels 5 and 6 consists of questions measuring beginning math concepts, problem solving, and math operations.

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