( centres of gravity)
The centre of gravity of an object is a point in it. If this point is above the base of the object, it stays stable, rather than falling over.
N-COUNT
( centres of gravity)
The centre of gravity of an object is a point in it. If this point is above the base of the object, it stays stable, rather than falling over.
N-COUNT
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006