以前家长会的日期和时间都是家长和老师约定的，但家长会以外的交流很少。

It used to be that parents and teachers had set days and times for parent-teacher meetings, but there was little communication outside the meeting.

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我们的历史老师枯燥地列举了一大堆日期。

Our history teacher recited dully a number of dates.

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该出生日期是1979年4月，当时一位学校老师用望远镜发现了发出恒星塌陷信号的超新星爆炸，因为在M - 100星系那里有明亮的光亮。

That birth date is in April 1979, when the supernova explosion that signaled the collapse of the star was spotted flaring brightly in the M-100 galaxy by a school teacher using a telescope.

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