阅读下面的短文，将划线部分的句子译成汉语或英语。
   My name is Bob. I live in Toronto, Canada.I want a pen pal in China.I think China is a very interesting country. I'm 14 years old and my birthday is in November. 我会说英语. I also know a little French. I have a brother. Paul, and a sister. Sarah. They have pen pals in the United Kingdom and Australia.I like going to the movies with my friends and playing sports. 我最喜欢的科目是体育.It’s fun. But I don't like math. It's too difficult!

如图所示，同一竖直面内的正方形导线框a、b的边长均为l，电阻均为R，质量分别为2m和m．它们分别系在一跨过两个定滑轮的轻绳两端，在两导线框之间有一宽度为2l、磁感应强度大小为B、方向垂直竖直面的匀强磁场区域．开始时，线框b的上边与匀强磁场的下边界重合，线框a的下边到匀强磁场的上边界的距离为l．现将系统由静止释放，当线框b全部进入磁场时，a、b两个线框开始做匀速运动．不计摩擦和空气阻力，则（   ）

健身用的拉力器结构如图所示，在拉杆处用力往下拉，能把配重提起从而起到锻炼身体的作用．

（1）图中A是一个 ____滑轮．

（2）已知配重的重力为500牛，不计摩擦和绳重，当将配重匀速拉起时，作用在拉杆上的力 ____500牛（填“大于”“等于”或“小于”）．

（3）当重物被提升1米时，拉力对重物所做的功是　 ____　焦．

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— _______ does he usually go to work?

— He walks to work.