重点讲解：
1. date back to 追溯（到）；开始（于）；始造（或建）（于）；
The college dates back to medieval times.
这所学院创办于中世纪s;*]S=&;kZUh。
2. at first 最初；起初；开始时；
At first I couldn't believe it. I thought it was a wind-up by one of my mates.
一开始我不相信，以为是哪个同伴在故意逗我Y[#oZP+PXcJ|v。
3. scoff at 嘲笑；讥讽；嘲弄；
At first I scoffed at the notion.
刚开始我对那种想法嗤之以鼻Tfk_Ii~z[Vm(|2Ievn。
4. at large 在逃的；未被捕获的；
The man who tried to have her killed is still at large.
那个企图雇凶杀她的男子仍然在逃eL##EzHR,D。