原文如下：

Rotate a group of atoms around a bond

You may want to rotate a selection of atoms around a bond, either to move all the atoms into a new position (mode move) or in order to split the grouping into two positions (mode split).

1) Select the group you want to rotate, including the bond you wish to rotate the group around.

2) Type 'mode fit'. The selected group now has changed colour a bit.

3) Right-click on the bond around which you want to rotate once (this 'activates' this bond)

4) Left-click on the bond, then move the mouse while holding down the left mouse button.

You also may wish to experiment with activating (right-click) other atoms, and holding down the SHIFT and CTRL keys while moving the mouse in the last step.

译文如下：

3.16. 使一个原子集绕一根键旋转

你可能希望绕键旋转选定的原子(集)，以将所有原子移动到一个新的位置(mode move)或将分组拆分到两个位置(mode split)。

1) 选择你希望进行旋转的分组，包括该分组要围绕旋转的键(其实不用选中该键)。

2) 键入'mode fit'并回车。现在所选分组的颜色将有所改变。

3) 右键单击你想要绕其旋转的键('激活'该键)。

4) 在该键上单击鼠标左键，然后在按住鼠标左键的同时移动鼠标。

你还可以尝试激活(右键单击)其他原子，并在上述最后一步中移动鼠标的同时按住SHIFT或CTRL键。

本文辅助视频如下：

3.16-使一个原子集绕一根键旋转

https://www.bilibili.com/video/BV19A411M7eA

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