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polar circle
极圈
极圆
polar circle
[ noun ]
a line of latitude at the north or south poles
<noun.location>
polar circle
polar circles
polar circuit
polar climate
polar cod
polar compass
polar compound
polar cone
polar conic
polar contact
polar continental air
polar control
polar control system
polar coordinate
polar coordinate curve
polar coordinate diagram
polar coordinate dist...
polar coordinate in s...
polar coordinate mani...
polar coordinate navi...
polar coordinate paper
polar coordinate posi...
polar coordinate repr...
polar coordinate robot
polar coordinate system
polar coordinate-paper
polar coordinates
polar coordinates in ...
polar coordinates robot
polar corpuscle
polar covalence
polar covalent bond
polar crane
polar crystal
polar curve
polar cushion
polar cushion of glom...
polar cusp
polar cyclone
polar dab
polar day
polar decomposition
polar developable
polar diagram
polar diagram recorder
polar dial
polar diameter
polar disc
polar displacement
polar distance
polar distribution
polar divisor
polar duplex
polar dye
polar easterlies
polar easterlies index
polar echo
polar effect
polar electrojet
polar element
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