重组可导致完全具传播可能的大流行病毒，出现爆炸性传播，突然造成病例激增。
Reassortment could result in a fully transmissible pandemic virus, announced by a sudden surge of cases with explosive spread.
能源密度在1990年到2003年间曾经回落，但由于像钢铁和水泥这样重工业的崛起，这个密度又突然激增。
Energy intensity fell between 1990 and 2003, but has since risen sharply as heavy industries such as steel and cement have surged.
美国出口的增长实际上比想象的更加强大(第二季度贸易差额的背后是进口突然激增)。
Indeed America's export growth has been much stronger (a sudden surge in imports was behind the second-quarter trade gap).
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