A state of emergency was called and precautionary evacuations ordered .

有关方面宣布进入紧急状态并下令进行预防性的疏散。

A lot of people were clueless . They had no idea there were evacuations .

许多人一无所知，他们不知道有疏散这件事。

Mandatory evacuations were in effect for neighbourhoods in glendale , pasadena and other cities and towns north of los angeles .

在格兰岱尔市（glendale）帕萨迪纳市（pasadena）和其他城市以及洛杉矶北部的城镇，强制撤离起到了效果。

But other countries , including the u. s.and canada , have adopted a wait-and-see attitude before ordering costly and logistically challenging evacuations , only advising their citizens at home to avoid travel to japan .

不过包括美国和加拿大等在内的国家，在确切的命令前和对疏散的成本考虑下还持观望态度，仅建议其本国公民避免到日本旅游。

Computer models are constructed based on the movement of groups under different geographical and behavioural scenarios , including emergency evacuations and riots .

依据群体在不同地理环境和行为情境下的活动，包括紧急疏散和骚乱时，建立计算机模型。