它缺乏引喻和距离感。

It lacks allusiveness and distance.

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因为它可以渗透到肺部深处，PM 2.5引起人们对健康的极大担忧，但研究人员缺乏数据来单独分析这些微小颗粒的实际影响。

PM2.5 is of especially great health concern because it can penetrate deep into the lungs, but the researchers lacked the data to analyze those tiny particles separately.

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缺乏信任可能由以下的四个因素之一引起。

That lack of trust may be prompted by one of four factors.

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