例句與造句

1. Synchronous motor clocks are rugged because they do not have a delicate pendulum or balance wheel.
2. These self-winding clock systems were usually low voltage DC . They were installed thru the 1950s and by then systems with synchronous motor clocks were becoming the clock system of choice.
3. It's difficult to find synchronous motor clock in a sentence. 用synchronous motor clock造句挺難的