The British Proclamation of 1763, the war of 1812, geological barriers and the lack of modern-day transportation all provided resistance against westward migration.

英国1763年公告、1812年战争、地理阻隔和现代交通的缺少都对向西迁移产生了阻碍。

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Now, this system is called Evacuated Tube Transportation (ETT), which monishes the air resistance of rail transit, but it essentially belongs to the category of rail transit all the same.

真空管道系统就是在现有的轨道交通基础上减小了空气阻力，其本质还是属于轨道交通的范畴。

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Working area for drag reduction agents (dra) is in turbulence area, and it can reduce resistance as well as increase transportation effectively.

减阻剂的作用区域在流体的湍流区，它能有效的降低流体阻力增加流量。

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Ms. DICKSON: A group of freedom riders had come to town in August of 1961, and although Rob wasn't participating with them because he would not take a position of being passive when it came to resistance, he was supporting them, offering them housing, transportation.

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