molecule ⪢⪢
http://qindex.info/i.php?x=16190
○○○ concept ⪢⪢
I learned some concepts of molecules before working in the science lab.
http://qindex.info/i.php?x=21343
 Now let's consider a system consisting of one molecule containing two atoms.
http://qindex.info/i.php?x=16206
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