so the first two quarters we took group lectures.

前两个季度我们集体听课。

群集课程 - SpeakingMax英语口语达人

He spent at least two-thirds of his more than, about three-quarters of his time in the northern states.

他至少花费了他旅程的三分之二,可能不止,应该是他旅程的四分之三时间,周游于北方各州

耶鲁公开课 - 美国内战与重建课程节选