The technician found a faulty circuit in the printer and replaced it within an hour.

技術人員在印表機裡發現一個故障的電路，並在一小時內更換完成。

Please email the supplier to confirm when the replacement circuit boards will be shipped.

請寄電子郵件給供應商，確認替換用的電路板何時出貨。

During the meeting, engineers explained why the new circuit design reduces energy costs.

會議中，工程師說明了新的電路設計為何能降低能源成本。