Conclusion: we're usually not talking about earth, or safety ground, when we need to specify a reference voltage.

结论：我们需要指定一参考电压时，我们通常不说大地或安全地。

youdao

He's devotion keeps my girls on a benevolent leash, one that hangs quietly at their side as they trot along but occasionally yanks them back to safety and solid ground.

他的忠诚使我的女儿们像一条仁慈的链子，当她们小跑时，这条链子静静地挂在她们身边，但偶尔会把她们拉回安全、坚实的地面。

youdao

They acknowledge the proposal is a tough sell for NASA, with its focus on safety, and suggest the private sector might be more fertile ground.

他们承认，要让美国宇航局接受这项提案很难，主要是安全性问题，因而向私营部门提出这个建议也许更有希望。

youdao

Lilly decided that a potential safety problem might ground the drug, and the company dropped it.

FORBES: Antibiotic Breakthroughs Fall Short

In a report to the board, its clerk said the club had an excellent record for ground safety.

BBC: Inverness stadium bar may open to away fans

Some safety yardsticks have not improved in many years, while recent accidents and incidents have exposed areas that still need work: safety on the ground at airports, the training of pilots to handle sophisticated computers, and greater awareness of flight hazards in some developing countries.

WSJ: Airlines Count Down to Safest Year on Record