Click on function symbol left of the Back button to show the functions palette.
点击Back按钮左侧的方法符号，显示函数面板。
You will probably notice the plus symbol (+) button in the top right of the toolbar.
您可能会注意到在顶部工具栏的右端有一个加号(+)按钮。
Press the button and write down each symbol on a clean sheet of paper as they appear on the screen.
按按钮并且在一张纸上按照显示屏记下每一个符号。
Press the button and write down each symbol on a clean sheet of paper as they appear on the screen.
按按钮并且在一张纸上按照显示屏记下每一个符号。
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