容易引起集體感染的共同特徵是通風不良.人們的聚集.與未指定多數的人接觸

容易引起集體感染的共同特徵是通風不良.人們的聚集.與未指定多數的人接觸的地方

結果 (英文) 1:

The common feature that is likely to cause collective infections is poor ventilation. The gathering of people. The place to contact with an unspecified number of people

結果 (英文) 2:

A common feature that is prone to collective infection swells poor ventilation. People's gatherings; places where contact with an unspecified majority is

結果 (英文) 3:

The common characteristics of collective infection are poor ventilation, people's gathering, contact with unspecified majority of people