在较少的情况中，通过输血，纵向传播(母婴感染)或器官捐献也造成感染。
Less frequently, it is due to infection through blood transfusion, vertical transmission (from infected mother to child) or organ donation.
基于光束传播法，对几种只沿纵向变化的锥形过渡波导的传输特性进行了分析。
The propagation characteristics of several kinds of laterally tapered transitional waveguides are analyzed using the beam propagation method(BPM).
对未充水和充水管道中纵向模态的传播特性进行了研究。
Propagation characteristics of longitudinal modes in pipes filled with and without water were investigated theoretically.
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