良导体

Copper is a good conductor of electricity.

铜是良导体。

Copper is a good conductor of heat.

铜是热良导体。

Wood is a poor conductor of sound.

木头是声音不良导体。

Copper is a good medium for the conduction of heat and electricity.

铜是热和电良导体。

Copper conducts electricity well.

铜是电良导体。