hard to upstream
难以上游
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Supplier firms have responded by locating more of their factories in low-cost locations and working hard to extract price concessions from their own, upstream suppliers.
供货商公司则压低他们工厂的价格和更加努力至力于向他们上游供货商压价，争取去价格让步。
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