| 摘要 |
A brush includes a brush body, a plurality of bristles, an operating member, and a biasing member. The brush body includes an upper wall, a lower wall that is aligned with the upper wall along a transverse direction, and that is movable relative to the upper wall, and a guiding member that extends upward from the lower wall through the upper wall. The bristles are mounted on a bristle-mounting surface of the upper wall, and are extendible through the bristle-extension apertures in the lower wall. The operating member is connected to the guiding member, and is operable to move the lower wall relative to the upper wall between upper and lower positions. The biasing member restores the lower wall from the lower position to the upper position.
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