即使没有区域差异的问题,岩石作为独特的时间标记也是一个难题。
In all this time Peter had really made some progress, though the rhymes still gave him difficulty.在这段时间里,彼得确实取得了一些进步,尽管他仍然觉得格言诗很难。
Xiaofan, a smart boy from Shenzhen, used to have difficulty in getting up on time, and his alarm clock was of no use at all.小凡,一个来自深圳的聪明男孩,曾经很难按时起床,他的闹钟根本没用。