The____(困难) is that there aren't any trains at that time.
问题描述：
The____(困难) is that there aren't any trains at that time.
答
difficult
原因就是difficult是名词,翻译为“困难”.整句的意思是：难办的就是在那个时间没有任何火车.（直译的话太别扭了,意译比较好.）