There is a student and a teacher in the laboratory.  The student is using a pipette to put something into a test tube.  The teacher is watching what the student is doing, and probably there to make sure she's doing it right.  The student was probably taking something out of a the test tube before.  The student is concentrating and hopefully trying her best to complete the assignment or to do the experiment properly.  She most likely wants a good grade (who doesnt).  The teacher is most likely relaxed and observes the student's technique, wanting her student to do well.  The student will probably complete the experiment and the teacher will most likely continuing to observe other students or let the student finish.
