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step up(使)增加, (使)加快速度
例句：The girl stepped up to school.
女孩子加快步伐去上学。
He has stepped up into the management of the firm.
他已升入公司的管理部门。
2.Four of them have been expelled from Ukraine, while the fifth has been detained.
expel from驱逐出,开除,排出
例句：They expelled the journalist from their country.
他们把这个记者驱逐出境。
3.He said neither the US government nor the private sector could fully control or protect the country's information infrastructure.
neither nor既不...也不...
例句：Lily's husband neither smokes nor drinks.
莉莉的丈夫既不抽烟也不喝酒。
4.This strike comes amid continued confusion as to whether a senior Taliban leader, Hakimullah Mehsud, died in a similar attack in January.
as to至于, 关于
例句：I have no doubts as to your ability.
关于你的能力我毫不怀疑。
按着，根据
例句：We sorted the eggs as to size and colour.
我们按着大小和颜色挑选鸡蛋。
