Well, there is something still more hidden than air, more invisible, more difficult to detect.

然而，还是有东西藏在空气中，它更不可见，不易察觉。

youdao

Well, there is something still more hidden than air, more invisible, more difficult to detect.

然而，还是有东西藏在空气中，它更不可见，不易察觉。

youdao