放置指针在上升和风偏旋钮上可以看见旋钮上部。

Put the mouse cursor over the elevation and windage knobs to see the tops.

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对于要调整其大小的列，沿着列标头的右边框放置指针。

Position the pointer along the right border of the column header for the column that you want to resize.

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它在两个域中都放置一个空指针来表示空链表，而不是为空链表定义一个单独的类。

Instead of defining a separate class for empty lists, it represents empty lists by putting a null pointer in both fields.

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