a of构词

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a piece of 一块（片）

a kind of 一种

a tuft of (hair,feathers,grass,etc.)

a skein of (yarn,thread,etc.)

a hank of (wool,silk,etc.)

a bob of (silk,hair,etc.)

a bowl of 一碗

a glass of

a cup of

a lot of

a type of

a number of