To rectify the fundamentals and clear the source; to address a problem at its root by dealing with its fundamental causes.
要解决公司业绩下滑的问题，我们必须端本正源，从产品研发和市场策略上进行彻底改革。
To address the issue of declining company performance, we must rectify the fundamentals, carrying out thorough reforms in product development and marketing strategies.
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