help a lame dog over a stile

例句：

1. 1. Shehelped me move the heavy furniture.
   她帮我搬了重家具。
2. 2. He helped his friendwith their project.
   他帮他的朋友完成了他们的项目。
3. 3. The teacher helped us understand the lessonbetter.
   老师帮助我们更好地理解了课程内容。