站到七尺以外的话，你已经非常接近背景水平，也就是说呼吸到正常的空气。

Move seven feet away, and you're "close to background, " i.e., breathing normal air.

youdao

你也可以改变背景图像就是显示日期后面。

You can also change the background image that is shown behind the date.

youdao

你也可以改变背景图像就是显示日期后面。

You can also change the background image that is shown behind the date.

youdao