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To start the arc the carbons are brought together for a short time.

If two atoms are brought close together, they ...

Work must be done on the molecular pair to pull (or drive, or move, or force) them together.

Gibbs' elegant results bridge the gap between two great world views: the mechanical and the thermodynamic.

Источник: Русско-английский научно-технический словарь на Gufo.me