All prerequisites for the start of a pandemic have therefore been met save one: the establishment of efficient and sustained human-to-human transmission of the virus.
因此，发生大流行的所有前提，只差一个还没有满足：病毒在人与人之间确立有效而持续传播。
2
It also explains the sustained appreciation of the Australian dollar, which has strengthened markedly since the start of the year.
息差还能解释澳元的持续升值(自今年年初以来呈愈演愈烈之势)。
3
In some cases, the answer may be to get to work early in order to carve out some sustained thinking time at the start of the day.