They advised people to continue taking sensible precautions including ventilating rooms, using face masks, testing regularly and isolating when symptomatic.

他们建议人们继续采取合理的预防措施，包括房间通风，佩戴口罩，定期检测，有症状时进行隔离。

The window was still open to ventilate the room, and it being about noontide the clear air was motionless and quiet without.

屋子里还开着窗子透风， 时近正午，窗外的清风一动不动， 静悄悄的。

If you're in a poorly ventilated room for a long period of time and someone's positive, there can be transmission inside those rooms. Eating together, very high-risk activity.

如果你长时间呆在通风不良的房间，并且有人是阳性的话，这些房间里可能存在病毒传播。一起吃饭是高风险活动。