- 口(mouth; opening)
- 向(face toward; face outward)
A mouth opening forward like a window of a house looking outward.
longitudinal
Longitudinal research requires a long time.
vertical
This line is vertical.
longitudinal
Longitudinal research requires a long time.
vertical
This line is vertical.
A mouth opening forward like a window of a house looking outward.
A mouth opening forward like a window of a house looking outward.
longitudinal
longitudinal
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