motorcades
n.
一长列汽车，（汽）车队( motorcade的名词复数 );
例句:
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They would patrol the collapsing cities usually in motorcades, and then return to their fortresses.
他们以车队巡逻废墟中的城市, 然后回到堡垒.
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While other delegations arrived in motorcades, the so-called "Grillini" travelled together in a single Kia minivan.
来自THETIMES