They seem to be walking on the ground, but actually they are walking in air, and their shoes don't touch the ground. Even when it's very muddy, their shoes stay very clean.

你看他像在地上走路，但是他是在虚空里头，那个鞋不沾地，也不沾泥土，甚至于在泞泥里走，他的鞋都很干净的。

youdao

Youth hostels are very popular in Britain as cheap but clean places to stay and this year is the 100th anniversary of the creation of the very first youth hostel.

青年旅社在英国非常受欢迎因为价格低而且干净。 今年是青年旅社创始100周年的日子。

youdao

Very clean. They have free Internet and their staff are very friendly and courteous. It worths to stay there again.

很干净，有免费互连网，服务人员非常友善及客气，值得住。

youdao

You then say, if you complete this training and you reach the targets and stay out of trouble for two years then, unless the crime was very serious, we just wipe the slate clean and you start your adult life with no convictions.

BBC: Crime: Politicians quizzed