She says people must keep up their guard against the virus, which is unpredictable and could change into a far more dangerous form.

VOA: standard.2009.12.29

Yeah, driving in LA, it's really unpredictable and can be dangerous.

是的，在洛杉矶开车，真的没法预测，可能很危险。

利用大众交通工具吧 - SpeakingMax英语口语达人