另外，图中还显示了两个菜单按钮，第一个在水平标题栏的上边，第二个在垂直标题栏的左边。

One more look at the figure will show two menu buttons, one above the horizontal header and a second to the left of the vertical header.

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另外两个函数allocMem()和gc()是在用户单击按钮时调用的。

Two other functions named allocMem() and gc() are called when the user clicks the buttons.

youdao

另外两个函数allocMem()和gc()是在用户单击按钮时调用的。

Two other functions named allocMem() and gc() are called when the user clicks the buttons.

youdao