An indispensable assistant or close confidant, often one who provides crucial support to a leader or organization; a pillar of support.
在公司的发展过程中，几位核心骨干一直是董事长的股肱心膂，为企业立下了汗马功劳。
Throughout the company's development, several key personnel have consistently been the chairman's most trusted and indispensable lieutenants, making significant contributions to the enterprise.
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