**Introduction:**

The diagram illustrates the process of electricity generation in a hydroelectric power station.

该图示意了水电站发电过程。

**Overview:**

This cyclical operation consists of two main phases: electricity generation during the day and water pumping at night, involving the use of gravitational force and energy conversion principles.

该循环操作包括两个主要阶段：白天发电和夜间抽水，涉及重力和能量转换原理的使用。

**Details:**

The dam retains water in the high-level reservoir, supplied by a river. During the day, water flows through an intake to the power station, where reversible turbines drive a generator, converting kinetic energy into electricity. At night, the intake is closed, and the generator remains inactive.

大坝在高水位水库中蓄水，由河流供给。白天，水通过进水口流向发电站，可逆涡轮驱动发电机，将动能转化为电能。夜间，进水口关闭，发电机保持不活动。

The generated electricity is then transmitted via power lines to the national grid, while the water flows into the low-level reservoir for storage. 生成的电力通过电力线路传输到国家电网，而水则流入低水位水库进行储存。

At night, the reversible turbines pump water from the low-level reservoir back into the high-level reservoir, completing the cycle of the electricity generation process. 夜间，可逆涡轮将低水位水库中的水泵回高水位水库，完成发电过程的循环。

cyclical operation

循环操作

electricity generation

发电

gravitational force

重力

energy conversion principles

能量转换原理

retains

保持

high-level reservoir

高水位水库

intake

进水口

reversible turbines

可逆涡轮

drive a generator

驱动发电机

converting kinetic energy

将动能转化

transmitted

传输

power lines

电力线路

national grid

国家电网

low-level reservoir

低水位水库

completing tthe cycle

完成循环