1。 Because the water in the refill is covered with oil, the oil can inhibit the backflow of water. For various reasons, sometimes a small amount of oil seeps into water, but the inhibition of oil on water has not weakened. You write the oil that permeates, and the water will naturally break. When there is no oil (after writing the oil, scrape it off the paper), it will recover naturally.

2。 The backlog causes the water to dry up, stagnate and cut off.

3。 The beads used to write in front of the pen end are missing.

I have also encountered many situations where water is cut off. These are my opinions.

I hope it helps you.

For the record, I also sent an anonymous one. If you want to choose mine, please choose this one.

Just opened. Thank you for your cooperation in typing hard.