估计使用年限 estimate useful life; estimated service life; estimated useful life 预计使用年限 expected useful life; probable life
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estimate useful life
估计使用寿命
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Industry analysts estimate that approximately 50% of distribution poles are 30 to 50 years old, and near the end of their useful life.
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