at后面加什么大地点还是小地点

例句：

The results of the research are summarized at the end of the chapter.

在这一章末尾对研究结果作了总结。

The resources at our disposal could have been better utilized.

我们所掌握的资源本来可以利用得更好，获得更高的效益。

He's an expert at getting his own way.

他在如何达到自己的'目的方面很在行。

The weather is very changeable at this time of year.

年年在这个时候天气都变化无常。

Almost all homes have at least one TV set.

差不多每家都至少有一台电视机。