1. particles
Particles of dust float in the atmosphere.
It is not enough to show that these two particles are moving at different speed.
Most foreigners will never fully master the use of German modal particles.
How can we define equilibrium for a system of moving particles?
Englisch Wort "cząsteczki"(particles) tritt in Sätzen auf:
Fotogrametria i teledetekcjaZawodowy Unit 7Test z angla2. molecule
A water molecule has two hydrogen atoms and one oxygen atom.
This molecule has a crystalline structure.
A molecule is made up of atoms.