To meticulously calculate every detail, gain, or loss; to be overly concerned with minor advantages, often to the point of being petty or making a fuss over trifles.
在项目谈判中，他总是称斤约两，仔细核对每一项开支，确保公司的利益不受损。
During project negotiations, he always meticulously calculated every detail, carefully checking every expense to ensure the company's interests were not compromised.
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