You can use spare sockets to try out different discrete component values. Just keep the ones that are spec-compatible in the circuit, and get the job done.

您可以使用备用插座，测试不同的分立元件值。只须维持规范的是在电路兼容，以及完成这项工作。

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Short circuit protection should be well handled on every single Spare lithium battery, moreover, only 2 spare lithium batteries are allowed per person.

携带备用锂电池必须单个做好保护以防止 短路，且只允许每人在手提行李中携带2 块备用电池。

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Mr. Johnson was the son of a circuit judge on Maryland's Eastern Shore, who was a horse trader in his spare time.

WSJ: Johnson Helped Turn Railroad Into Conglomerate