static circuit

例句：

1. 1. The circuit is static because it has no moving parts.
   这个电路是静态的，因为它没有移动部件。
2. 2.The battery is static because it stores energy in a form that doesn't change over time.
   电池是静态的，因为它以一种不会随时间变化的形式储存能量。
3. 3.The circuit is static because the current flows only when there is an external stimulus.
   电路是静态的，因为电流只在有外部刺激时流动。