1Metal — a general term for elements or alloys, such as iron, copper, or aluminum, that are typically shiny and conduct electricity and heat well.
この橋は丈夫な金属で作られている。
This bridge is made of sturdy metal.
空港の金属探知機に反応してしまった。
I set off the metal detector at the airport.
金や銀も金属の一種だ。
Gold and silver are also types of metal.