To add an inferior or unworthy part to a superior work, thereby spoiling the whole; to make an inappropriate or incongruous addition.
这部系列作品的前几部都非常经典，但最新一部的剧情俗套且逻辑不通，简直是狗续貂尾，让人感到非常遗憾。
The previous installments of this series were all classics, but the plot of the latest one is clichéd and illogical; it's simply adding an inferior part to a superior work, which is very disappointing.
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