All the tree leaves, the flower leaves and grass leaves get very green and very clean.

所有的树叶、花叶和草叶变得特别绿，特别干净。

youdao

On a tree next to a river in Amsterdam, a tiny birdhouse glows (发光) bright green when the air is clean.

阿姆斯特丹河旁的一棵树上，一小小的鸟舍会在空气清新的时候发出明亮的绿色。

youdao

The build utility removes the build tree after the packages are made (--clean).

构建实用程序在生成包之后删除构建树（--clean）。

youdao

The company said it hoped to complete the clean-up operation, including removing tree houses and closing tunnels, on Monday.

BBC: UK Coal say Wrekin protesters 'peacefully' evicted

It has smooth, tree-lined avenues, clean public spaces and half-decent new buildings.

ECONOMIST: China

So turn on the Beatles or whatever you love, plant a tree, join a community clean-up day and get some little, easy weights to use at home.

FORBES: Living a Vigorous Life As We Age