奥巴马夫人白宫举办健身活动

短语讲解：

1.  It is aimed at solving the problem of childhood obesity in only one generation.

aim at以…为目标
例句：The visit was aimed at expanding the relations between the two countries.
访问的目的是扩展两国的关系。

2. Exercise is close to the first lady's heart, and on this day she was not afraid to show it.

be close to接近,靠近
例句：It is close to fact.
这更接近于事实。

3. She ran around with the kids and encouraged them in the various drills.

run around东奔西跑，到处乱跑
例句：They love to run around on the playground.
他们喜欢在操场上跑来跑去。

4. "You don't have to be a superstar athlete to enjoy sports and to move, but getting involved in something like this can help you in so many different ways," added Obama.

involve in使参与〔陷入, 牵扯到〕
例句：The vast masses there have become involved in the health campaign.
那里的广大群众都参加了卫生运动。

5. The first lady would like to make a difference in that situation before her husband leaves office.

make a difference有关系；有影响；有意义
例句：What you have told me may make a difference to my own position. 
你告诉我的一切，可能影响我自己的看法。 
leave office离职，下台
例句：To leave office before my term is completed is abhorrent to every instinct in my body.
在我总统任期未完之前要辞去职位是违反我的本意。