The plurality of suction channels permits effective pick-up of dirt, which may be further enhanced by an air duct in the form of a slot (48), which draws air over some of the working edges (42, 44).

多个吸入通道允许有效的拾取脏物，其可通过为狭槽(48)形式的空气管道得到进一步地增强，该狭槽在工作边缘(42,44)的一部分之上吸入空气。

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