1.go back to 回去；歸

I'll go back to the appfog example.
現在回到最開始的那個appfog的故事。

Go back to your tents!
回你的帳篷去！

2.free to 免費

Feel free to share in the comments area.
請在下面的評論區域自由分享。

A gyroscope is just a spinning wheel that is free to rotate.
陀螺就是一個可以自由旋轉的轉動著的輪子。

3.primary school 小學，初等學校

Nobody in her family has ever finished primary school.
她的家庭中沒有人完成過小學學業。

The design and strategy of primary school outside reading network.
小學生課外閱讀網絡化的教學設計及策略。

4.senior school 大齡兒童學校；高中

Improving senior school students reading ability by extensive reading.
通過泛讀提高高中學生的閱讀能力。

For example, lower grade pupils study for praise of teachers and parents. While, higher grade pupils study to get outstanding scores to enter a key senior school instead of hoping to get praise.
比如低年級的小學生，其主導性學習動機可能僅僅是為了得到教師和家長的夸獎，而小學高年級學生學習的主導性動機即不再是為了得到夸獎，而是為了獲得優異成績，以便進入重點中學。