goodbye是不可数名词。
goodbye：int./n.再见；再会；例如：She said goodbye and thanked us for coming.
She said goodbye and tripped off along the road.
她说了声再见就连蹦带跳地沿路走了。
She said goodbye and scurried back to work.
她说声再见，然后扭头跑回去干活了。
She hurried away without saying goodbye.
她连声再见都没说就急忙离开了。
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