Examlex
This microscope uses two beams of light to produce a three- dimensional, color image.
Stranger Anxiety
An infant’s fear of and wariness toward strangers; it tends to appear in the second half of the first year of life.
Unsmiling
Displaying a serious or stern expression, without smiles.
Cheerful
Exhibiting a disposition that is full of joy and optimism.
Reflexive Smiling
An involuntary smile, often occurring in infants, that does not necessarily express happiness or response to social interactions.
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