| 摘要 |
A sieve includes a rectangular reservoir that has a screen bottom. The sieve also includes a first side flange that is positioned on one side of the reservoir and a second side flange that is positioned on the opposite side of the reservoir. The reservoir is adapted to fit within a container where the two side flanges extend over and rest on opposite sides of the container. The reservoir is movable within the container, whereby, when the powdered substance is inserted into the sieve, the sieve sifts the reusable powdered substance from the non-reusable powdered substance.
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