制地图、写菜单、做采访……昨天在俞源的任务日，海外名校学子一早便走出家门，为完成任务忙碌。
Drawing maps, designing menus, conducting interviews...... Yesterday is a task day. Overseas participants got up early and kept busy with their tasks.
作者认为格林当时关心利比里亚的奴役劳工状况，其在《没有地图的旅途》有一段秘密任务就是作为反奴隶制社会的耳目。
The author believes that Greene's concealed agenda in "Journey Without Maps" was to act as eyes and ears for the Anti-Slavery Society, concerned at that time about slave Labour conditions in Liberia.
印刷术发明以前，类似托勒密所制的地图很少见，而且价格不菲，因为当时的地图必须以手工绘制。
Before the invention of printing, maps like Ptolemy's were rare and expensive because they had to be hand drawn.
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