The researchers found that incidence rates over this 30 year-period were stable, decreased, or continued a gradual increase that started before the introduction of cell phones.

研究人员发现，在这三十年中，脑瘤发病率保持稳定、减少，或在推出手机之前，就继续递增。

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The consumer price of the residents nationwide dropped by 0.7 percent from last year's same period, showing a trend of slight increase while remaining stable.

一季度全国居民消费价格总水平同比上涨0.7%，呈现出平稳并略有上涨的势头。

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Calcitonin levels remained stable and did not increase during the 2-year period in a subset of 146 randomized patients.

在两年的试验期间一群146名随机受试者的降钙素水平保持稳定。

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