磋
=
差
+
石
:
Kitty Cat (cu) is going to give a presentation at a meeting in front of the observatory (o1). To improve her presentation she is polishing (磋) her error bars (差) with a stone (石).
to rub or roll between the hands or fingers / to twist
搓
=
差
+
扌
:
Kitty Cat (cu) is examining error bars (差) in front of the observatory (o1). She rubs (搓) and rolls (搓) the error bars with a toy claw (扌) to see if it easily breaks.