The delivery truck was delayed because a mechanic found a cracked rear axle.

送貨卡車延誤了，因為技師發現後車軸有裂痕。

Please email the supplier to confirm the replacement axles will ship by Friday.

請寄電子郵件給供應商，確認替換用的車軸會在週五前出貨。

During the factory tour, the manager explained how each axle is tested for strength.

參觀工廠時，經理說明了每根車軸如何進行強度測試。