学生在二年级时可以选择出国学习。
Students have the option of studying abroad in their second year.
所有的学生都在一年级和二年级结束时做了牙齿 X 光检查。
All the students had their teeth X-rayed at the end of the first and second years.
读二年级时，有一天，我们班到乡村进行周末漫步。
One day in the second grade, our class went on a weekend ramble in the countryside.
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