She was introduced and stepped up to the podium.
介绍完毕后她就登上讲台。
，
，提升，升高（电压），站出来She was introduced and stepped up to the podium.
介绍完毕后她就登上讲台。
He steps up onto the chair.It wobbles queasily.
他站到椅
上，椅被踩地颤动起来。
He has stepped up into the management of the firm.
他已升入公司的管理部门。
Brewer stepped up to the commission and had his innings too.
布鲁尔进入委员会，也经历了他的活
。
The girl stepped up to school.
步伐去上学。
The tempo has been stepped up.
速度一点点地起来了。
When everything is running smoothly, why must he step in and foul thing up?
一切正在顺利进行时, 为什么他一定要插进去把事情弄糟呢?
In recent weeks, China has vowed to step up its own inspections of agricultural and food exports and prove that the country does not have a problem with melam-tainted food or feed ingredients.
近几周，中国宣誓将它对出口农产品和食品的检验，并证明它已不存在三聚氰胺污染食品及饲料添剂的问题。
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