一清二白;
The walls must be perfectly clean before you paint them.
油漆之前必须把墙壁完全擦干净.
The wood is perfectly clean, delicate jade, known as celluloid.
其木质洁白无瑕, 细腻如玉, 被誉为假象牙.
Is this cup for the urine sample perfectly clean?
这个装尿样的杯子是否绝对干净?
How does a diver achieve a perfectly clean entry?
运动员怎样才能做到干净利落地入水?
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