1. He steps up onto the chair.It wobbles queasily.
   他站到椅子上，椅子被踩地颤动起来。
2. She was introduced and stepped up to the podium.
   介绍完毕后她就登上讲台。
3. He has stepped up into the management of the firm.
   他已升入公司的管理部门。
4. Brewer stepped up to the commission and had his innings too.
   布鲁尔进入委员会，也经历了他的活跃期。
5. The tempo has been stepped up.
   速度一点点地加快起来了。
6. The girl stepped up to school.
   女孩子加快步伐去上学。
7. 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?
8. 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，中国宣誓将加快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加剂的问题。

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