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the Silk Road
The Silk Road is a famous route in world history.
(geometry) a circumcircle
In geometry, the circumcircle of a triangle is the circle passing through the three vertices of the triangle.
(geometry) an incircle
In geometry, an incircle is a circle that is tangent to all three sides of a triangle.
(geometry) an excircle
The excircle of a triangle is the circumcircle of the triangle.
steps; the ways around
He walks very slowly, taking small steps.
to lapse back into one's old ways; to relapse into vice
He has lapsed back into his old ways.
high-speed rail
High-speed rail is a modern and convenient means of transportation.
(anatomy) lower respiratory tract
The lower respiratory tract includes the trachea and lungs.
(anatomy) upper respiratory tract
The upper respiratory tract includes the nose, throat, and trachea.
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