Air is not so clean as it once was.

空气不如以前那样干净了。

youdao

So if the poor hygienic conditions, such as to the guests tea cup, are not so clean.

所以如果卫生环境很差，比如给客人喝茶的杯子，都不是那么的干净。

youdao

Not only are the cars spotlessly clean, so are the drivers – always wearing white gloves, a suit and a tie.

不仅车子相当干净、一尘不染，司机们也是一样——总是戴白手套、穿西装、打领带。

youdao

I have lived with other roommates where they were not so clean.

我也和其他室友住过，他们可没那么爱干净。

布鲁克林的房价 - SpeakingMax英语口语达人

And if the other guy does tidy up, hey the room's clean, Who cares? So either way, you're not going to tidy up and you end up with a typical Yale dorm room.

要是别人打扫完了,屋子干净了,我赚了,最后谁都不去打扫寝室,寝室当然就脏了

耶鲁公开课 - 博弈论课程节选

and then, you know, the trains are not so clean,

然后，你知道，火车不怎么干净，

利用大众交通工具吧 - SpeakingMax英语口语达人

So not only are we generating clean energy, but we're also making money.

BBC: Wind turbines

Getting clean will not be so easy.

CNN: Commentary: America can't go cold turkey on credit

For us not to be the leaders in investing in clean energy manufacturing so that wind turbines and solar panels are not only designed here in the United States but made here in the United States makes absolutely no sense.

WHITEHOUSE: Twitter Town Hall