宇宙中的许多物体是看不见的，但它们发射无线电波。

Many objects in the universe are invisible, but they send radio waves.

youdao

无线电波广泛存在于自然界中，从声波、光波到空间中的宇宙射线。

Radio waves exist in nature, from sound and light to cosmic rays in space.

youdao

宇宙浸泡在无线电波的海洋中。

The universe is bathed in a sea of radio waves.

youdao

宇宙浸泡在无线电波的海洋中。

The universe is bathed in a sea of radio waves.

youdao