• The molecules engage in Brownian motion .
• The point executes ( or carries out ) harmonic motions .
• The molecules engage in Brownian motion .
• The point executes ( or carries out ) harmonic motions .
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012