like: hydro → →
der Wasserstoff ☊ 
hydro ☊ 
☊ 2871
Water consists of hydrogen oxide. ☊ Nước bao gồm hydro dioxide. ☊ Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water. ☊ atom ☊
Hydrogen and oxygen combine to form water. ☊ combine ☊
combine with sth: Hydrogen combines with oxygen to form water. ☊ combine ☊