B2 mainly UK US usually disk a circular flat object圆盘,盘状物
C2 mainly UK US usually disk a small piece of cartilage (= strong body tissue that stretches) between the bones in your back椎间盘
More examples
Flatten the pastry into a thin disc with your hands.
The sun looked like an orange disc, barely visible through the haze of gas and ash that filled the sky.
His greatest hits album consists of 2 discs and over 40 songs.
A DVD is a five-inch disc that plays films as well as music.
A gold disc is awarded when a million dollars worth of records are sold.
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