一清二白;
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?
The walls must be perfectly clean before you paint them.
油漆之前必须把墙壁完全擦干净.
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