3a-based Sieves do not co-adsorb the sulfur species .
3a分子筛不共吸附硫类。
This uses special membranes which act as molecular sieves by passing water molecules while holding back the ions , such as sodium and chloride , that make water salty .
Youtube can 't compete with conventional broadcasting at reaching billions of people instantaneously . But it operates outside the control of conventional gatekeepers and editorial sieves .
