Although it's worth mentioning that you need prior permission from the course instructor to do this.

尽管，值得一提的是，你需要事先得到课程老师的许可才能这样做。

The government's pushing through a bill which would bar almost anyone entering Britain on small boats or without prior permission from claiming asylum.

政府正在推动一项法案， 该法案将禁止几乎任何人乘坐小船或未经事先许可进入英国寻求庇护。