把这一句，留给此刻的你
An insuperable obstacle to rapid transit in Africa is the want of carriers, and as speed was the main object of the Expedition under my command, my duty was to lessen this difficulty as much as possible.
在非洲快速运输的一个无法克服的障碍是缺少运输工具，由于速度是我指挥下的这次远征的主要目标，我的职责就是尽可能减少这种困难。