You will be given a definition of a task first, then some input of the task.
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

The atoms in molecules , crystals , metals and diatomic gases are held together by chemical bonds .
Output:
The atoms in molecules , crystals , metals and diatomic gases — indeed most of the physical environment around us — are held together by chemical bonds , which dictate the structure and the bulk properties of matter .