小狗一看到主人就欢快地蹦跳着跑开了。

The puppy ___bounded off happily when it saw its owner.

我们的后院以一排篱笆为界。

Our backyard is ___bounded by a row of fences.

我们必须把讨论范围限制在与项目直接相关的话题上。

We need to keep our discussion ___bounded to topics directly related to the project.