The ability of certain materials to carry electricity with no resistance at all — usually only when they are made extremely cold. Normally, when electricity flows through a wire, the wire fights it a little and some of the energy is lost as heat; that is why a charger gets warm.

The ability of certain materials to carry electricity with no resistance at all某些材料能夠完全沒有電阻地導電的能力 — usually only when they are made extremely cold通常只有在把它們冷卻到極低溫時才會發生。Normally, when electricity flows through a wire平常電流通過電線時, the wire fights it a little and some of the energy is lost as heat電線會稍微阻礙電流，一部分能量會變成熱散失掉; that is why a charger gets warm這就是為什麼充電器會發熱。

In superconductivity that loss drops to zero: start a current going in a closed superconducting loop and it will keep going round and round without fading. Another famous effect comes with it — the material pushes magnetic fields out, so a magnet placed above it floats in mid-air.

In superconductivity that loss drops to zero在超導現象裡，這種能量損耗會降到零: start a current going in a closed superconducting loop只要在一個封閉的超導迴路裡啟動一個電流 and it will keep going round and round without fading它就會一直繞圈流動，不會衰減。Another famous effect comes with it還有一個著名的伴隨效應 — the material pushes magnetic fields out這種材料會把磁場推出去, so a magnet placed above it floats in mid-air所以放在它上面的磁鐵會懸浮在半空中。

This is a physics and engineering term, uncountable, and it names the property or the phenomenon, not the material. Real uses today include the magnets inside hospital MRI scanners and inside particle accelerators.

This is a physics and engineering term這是一個物理和工程學的術語, uncountable是不可數名詞, and it names the property or the phenomenon, not the material指的是這種特性或現象本身，不是指材料。Real uses today include the magnets inside hospital MRI scanners and inside particle accelerators今天實際的應用包括醫院MRI掃描儀和粒子加速器裡的磁鐵。

The great open goal of the field is a material that does this at room temperature, which would change how the world moves electricity; claims of it appear in the news every few years and have so far not held up.

The great open goal of the field這個領域最大的未解目標 is a material that does this at room temperature是找到一種能在室溫下做到這件事的材料, which would change how the world moves electricity這將會改變全世界輸送電力的方式; claims of it appear in the news every few years每隔幾年新聞就會出現這樣的宣稱, and have so far not held up但到目前為止都沒有被證實站得住腳。