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瑞贝卡tt
三个是分别是am is are.统称为be.
肥航哒哒哒
They collectively referred to as fruit.这是,他们统称为水果 They are collectively referred to as vegetable.这是它们统称为蔬菜
小白贼黑
尊称address sb.respectfully谦称 Complimentary Close 专称Unipotent stem cells统称be called by a joint name
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