A few days before a big social-science exam, the instructor informed us that he would hold an optional review session the next day.

在一场大型社会科学考试前几天，导师通知我们第二天他将会给我们上一节选修复习课。

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Eye-care professionals hold clinics for two weeks. Patients receive an eye exam and a used pair of glasses, if needed.

眼保健专业人员开设为期两周的诊治活动。患者可在此接受眼睛检查，如需要还可以得到一副旧眼镜。

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Eye-care professionals hold clinics for two weeks. Patients receive an eye exam and a used pair of glasses, if needed.

眼保健专业人员开设为期两周的诊治活动。患者可在此接受眼睛检查，如需要还可以得到一副旧眼镜。

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