The aluminum-free two-quantum-well semiconductor laser which wavelength is 940 nm is made by MOCVD.

利用MOCVD研制了无铝双量子阱列阵半导体激光器。

youdao

Nowhere in nature is aluminum found free, owing to its always being combined with other elements.

由于铝总是和其他元素结合在一起，所以在自然界中找不到游离的铝。

youdao

Nowhere in nature is aluminum found free, owing to its always being combined with other elements, most commonly with oxygen.

由于铝总是和其他元素结合在一起，最常见的是和氧结合，所以在自然界中找不到游离的铝。

youdao

Described as a "mega-scale free form printer" by its makers, the massive aluminum structure uses sand, which it forms back into a material that's like marble.

CNN: Architect to build home using 3-D printer