这部纪录片是在交通当局的合作下制作的。

This documentary was made with the cooperation of the transportation authority.

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This documentary was made with the cooperation of the transportation authority.

cooperation 是名词,由前缀 co-(表示"共同")和 operation(操作、运作)组成,字面意思是"共同运作",引申为"合作、协作"的意思。

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