1. The old clock tower was filled with intricate cogwheels that turned slowly to keep time.
那座老时钟塔里装满了精致的齿轮，缓慢地转动以保持时间。

2. The machine stopped working when one of the cogwheels became jammed.
当其中一个齿轮被卡住时，机器停止工作了。

3. The engineer carefully inspected each of the cogwheels to ensure they were properly aligned.
工程师仔细检查每个齿轮，以确保它们对齐正确。

4. The sound of the cogwheels turning echoed through the empty factory.
齿轮转动的声音在空荡荡的工厂中回响。

5. The clockmaker spent hours meticulously cleaning and oiling each of the cogwheels in the timepiece.
钟表匠花了数小时仔细清洁和润滑时钟中的每个齿轮。

6. The intricate system of cogwheels allowed the steam engine to power the entire factory.
复杂的齿轮系统使得蒸汽机能够为整个工厂提供动力。