这台机器的运转依赖于相互咬合的齿轮传递动力。

The machine's operation depends on interlocking ___gearwheels to transfer power.

公司的各个部门就像相互啮合的齿轮，必须协调运转才能取得最佳业绩。

All departments in the company must function like perfectly meshed ___gearwheels to achieve optimal performance.