Article in English: This is the most efficient, and often preferred, way of performing a partial water change, especially in larger tanks. Attach the device directly to your faucet and then insert one of the connected hoses and siphon attachments into your tank. The device will automatically suck out water for you, until you switch it off. Then, flip the switch again and insert the faucet hose to refill the tank.  This method is especially useful for those people unable to haul multiple buckets of water around in order to perform regular cleanings. It also minimizes the potential to create a watery mess. Just make sure that the new water that you are adding is close to the original temperature of the tank. Check this before starting the automatic suctioning process. If you don’t have an all-in-one system, then you will need to perform the water switch by hand. Start by placing the tube end of your siphon into a bucket. Then, place the siphon tip into the tank’s substrate, usually gravel or sand. Repeatedly insert the siphon deep into the sand at an angle, drawing out both debris and tank water. Don’t feel as if you have to perfectly clean all of the gravel during each change. In fact, it is better if you section off your tank and clean certain areas of the gravel each time. This lessens the impact of the change for your fish. As you move your siphon around, you will notice that your bucket begins to fill with dirty gravel and murky tank water, this is perfectly normal and what you want. However, don’t take it too far. Use your siphon to remove a maximum of 30% of the tank’s water. Going beyond this can irreparably alter your tank’s chemistry. For example, if you have a 10 gallon tank, it is a good idea to use a 3 gallon bucket for water changes. Then, when the bucket is full, you know that you’ve removed the right amount of water. Now that your tank is less full, spend a bit of time checking out the status of your tank from an inside view. If you don’t fully remove your decorations, then perhaps pick them up and look them over...

Summary in Chinese:
使用自动换水器。 用砾石虹吸管吸除箱底的所有杂质。 抽走水族箱里的水。 把水族箱内部每一处都仔细检查一遍。 留意箱内剩余水的温度。 用预处理过的水重新注满水族箱。 更换所有装饰物和水草。 重新接通过滤系统、加热器和照明灯。 清洗并存放设备。