求翻译：对于MJN3型照明节能电源，我们在多种负载（包括空载、高压钠灯负载、混合灯具负载、电阻负载）下经过了较长时间的严酷测试，累计换挡次数超过了200,000,000次。是什么意思？

For MJN3 lighting energy-saving power, we are in a variety of loads (including no-load, high pressure sodium lamp loads, mixed lighting load, resistive load) after a longer period of time under harsh test, the cumulative frequency shift over 200,000,000 times.

For Type 3 MJN lighting energy saving power, we are in a multi-load (including empty, high pressure sodium lamps load, mixed-lamp load, resistance load) after a long time under the harsh test, the cumulative-for-block more than 200,000,000 times.

Regarding the MJN3 illumination energy conservation power source, we in many kinds of loads (including idling, high-pressured sodium lamp load, mix lamps and lanterns load, resistive load) under passed through the long time severe test, the accumulation shifted gears the number of times to surpass 2

For MJN3 lighting energy-saving power supply, we are in a variety of loads (including idling, loading, mixing high pressure sodium lamps, resistance load) after a long period of harsh tests under, the cumulative shift over 200,000,000.

As to the energy-conserving power of Model MJN3 illumination, we have passed the fairly long harsh test under many kinds of load (including empty load, high-pressure sodium light are supported, mixed the lamps and lanterns are supported, the resistance is supported), the number of times is over 200,