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.

譯文如下：

3.16. 使一個原子集繞一根鍵旋轉

你可能希望繞鍵旋轉選定的原子(集)，以將所有原子移動到一個新的位置(mode move)或將分組拆分到兩個位置(mode split)。

1) 選擇你希望進行旋轉的分組，包括該分組要圍繞旋轉的鍵(其實不用選中該鍵)。

2) 鍵入'mode fit'并回車?，F在所選分組的顏色將有所改變。

3) 右鍵單擊你想要繞其旋轉的鍵('激活'該鍵)。

4) 在該鍵上單擊鼠標左鍵，然后在按住鼠標左鍵的同時移動鼠標。

你還可以嘗試激活(右鍵單擊)其他原子，并在上述最后一步中移動鼠標的同時按住SHIFT或CTRL鍵。

本文輔助視頻如下：

3.16-使一個原子集繞一根鍵旋轉

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

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