英国国家航空交通局(一个协调空中交通的机构)表示最早截至星期二凌晨，禁飞令都将有效。

Britain's National air Traffic Service, an organisation that co-ordinates air travel, said that the flight ban would remain in place until early Tuesday morning at the earliest.

气象局警告说，在周五的大部分时间，云层都会在英国上空徘徊，由此可能导致禁飞令进一步延长。

The Met Office warned that the cloud is likely to linger over Britain for most of Friday, which could cause the no-fly restrictions to be extended further.

颁布禁飞令是因为一旦如伦敦VAAC所预测那样，火山灰扩散甚远，航班就难以飞过火山灰所覆盖的航线。

The ban was imposed because once the ash cloud, as predicted by VAAC London, had spread out far enough it was hard to get any routes through it.

汉森预想的禁煤令还有第二个问题：改变的规模。

The second problem with Hansen's prospective coal ban: scale.

“弛山泽之禁”、“均田”、厚偿运河植树等规定，皆以“令”的形式表达。

The regulation, such as relaxing of prohibition of cutting down trees in mountain, average distributing land, awarding planting trees along the canal generously, are conveyed by decree.