MicroRNAs could be used to seal off human cells from disease-causing viruses, or to disable viruses that gain entry.

小分子核糖核酸可以用来封闭人体细胞，使之免受致病病毒的侵扰，或者使病毒丧失侵入细胞的能力。

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As to the problems of bearing disable, the mend method on seal structure of the screw conveyer for powder materiel is put forward, and the applied effect is demonstrated.

针对粉状物料螺旋输送机轴承损坏问题，提出了轴承密封结构的改进措施，说明了改进后的应用效果。

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