I don't believe it: down is the insulator, not the wall.

我不相信：下跌是绝缘体，而不是墙。

youdao

The insulator iodine becomes a metal, and sodium becomes insulating.

绝缘的碘可以成为一种有金属性质的物质，而钠则可变成绝缘体。

youdao

Note the top electrode is guarded, so that only current flowing across the insulator is measured by the picoammeter.

注意，顶部的电极接保护，所以只有流经绝缘体表面的电流才为皮安计所测量。

youdao

It means that electrons from the metal can end up in the superconductor without having to pass through the insulator.

ECONOMIST: Microrefrigeration

The better the insulator, the more charge a capacitor can hold.

ECONOMIST: Combinatorial chemistry

Glasslike silicon dioxide has been the insulator of choice in electronic chips since 1959, when Bob Noyce cobbled together the first silicon integrated circuit--wires and switches etched into silicon insulation.

FORBES: Magazine Article