The senior official said airborne transmission couldn't be ruled out in crowded, closed, or poorly vented settings.

这位高级官员表示，不能排除病毒在拥挤、封闭或通风不良的环境中通过空气传播的可能性。

A senior official said airborne transmission could not be ruled out in crowded, closed or poorly ventilated settings.

一名高级官员表示，不排除在拥挤、密闭或通风不良环境中通过空气传播的可能性。

On Monday, an open letter from over 200 scientists accused the WHO of underestimating the possibility of airborne transmission.

周一，来自200多名科学家的一封公开信指责世界卫生组织低估了空气传播的可能性。