It must work without a hitch. 必须能够无故障运行。

It has been tested for nine times. 我们已经对其进行了九次测试。

These elements seem to be working well under high voltage. 这些元件在高压下似乎性能良好。

These elements seem to be working well under high voltage. 这些元件在高压下似乎性能良好。

Yes, that's one of the best things. 是的，这是其最大的特点之一。