I
см. тж. в месте соединения ; соединён параллельно
• A fish plate is a simple bar used for joining rails in tracks.
• A welded joint ...
II
см. тж. вступать в ~
• Linking together the monomer units ...
• Oxidation is defined as the combination ( or union ) of oxygen with some other element.
• A chemical compound .
• The term "hydride" is used to describe a compound of an element with hydrogen.