After reaching the rated speed, a potential-free contact (compressor running) is required for control system. The contact must be closed in this state.

当达到额定转速后，控制系统需要一个无压降连接(压缩机运行)，在这种状态下接触器必须闭合。

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Potential customers are softened up with free gifts before the sales talk.

谈生意之前，先送给潜在的客户一些赠品，以联络感情。

《牛津词典》

Now, the chemical potential, as we saw, was the Gibbs free energy.

现在，化学势，就像我们看到的，等于吉布斯自由能。

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The younger you are when you inherit an IRA, the longer you can stretch out those withdrawals, enjoying more time for potential tax-free growth of the investments.

WSJ: Family Value: Leaving Your Roth IRA to the Kids

Japan and Australia, sponsors of rival grand commissions when a potential nuclear-free window opened at the cold war's end, have joined forces to set up a new one.

ECONOMIST: Nuclear disarmament

Unfortunately, the more attractive membership becomes, the more costly the signal of commitment required to discourage potential free-riders.

ECONOMIST: Letters | The