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.
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.
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.
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