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to continue for an excessively long time
持续很长时间
There's no telling how long the talks could drag on.
谁也说不准谈判还会拖多久。
to slow down or limit the development of someone or something
拖累，成为…的累赘
She didn't want a husband who would be a drag on her career.
她不想要一个拖累她事业的丈夫。