但这个水平仍在多数日间工作之上。
多数人在感染艾滋病毒后有3至12周“窗口期”，在此期间，人体仍在产生艾滋病毒抗体，但这些抗体尚无法测出。
Most people have a "window period" of 3 to 12 weeks during which antibodies to HIV are still being produced and are not yet detectable.
继利比亚紧张局势升级之后，绝大多数主要等级的石油价格日前均大幅上扬，尽管近来价格有所反弹，但仍在波动之中。
Prices of most major grades of oil spiked last week after tensions heightened in Libya and, although they've retreated a bit, they remain volatile.
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