There is no guarantee that the door that is open now will remain open in the future.

There are those who superficially see this as "the natural word" and those who [have a clear idea of what is going on

Some people see an open door and think, "Oh, that's a nice door, let's go in this time," while others think, "Oh, that's a nice door, it might close soon, let's go in this.

concrete example

• Someone said "I'm not sure yet this year, so I'll apply next year" for an event that used to be held annually that involved a selection of applicants.
  • But next year, the event itself will no longer take place.
  • I've seen this happen many times in my life.
    • It could be a change in budget, the spread of infectious diseases, or many other changes.
    • Sometimes middle and high school students don't yet know that "doors close" themselves.
• Someone's idol group broke up when they were planning to attend an upcoming idol event.

metaphor - door

relevance - strike while the iron is hot - fortune

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