Other cities became major ports or places of deportation, for the domestic slave trade.

另一些城市则成为了国内奴隶贸易的,主要港口和奴隶被驱逐出境的地区

耶鲁公开课 - 美国内战与重建课程节选

On second exposure it's different, that IgG is produced predominantly on second exposure to an antigen.

而再次免疫则不同,再次接触相同的病原体时,人体主要产生的则是IgG

耶鲁公开课 - 生物医学工程探索课程节选