两条不同颜色的出气管，便于区分，更加卫生；
Two different colors of the trachea , easy to distinguish , more health;
你可以针对不同的馅料包成不同的形状以便于区分。
当配线采用多相导线时，其相线的颜色应便于区分，相线与零线的颜色应不同。
When the wires are multiphase conductor, it should be easy for us to distinguish the colors, and the color of phase should be different from that of the zero line.
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