Thank you for your kindly answer @MutedJam !!
I’m really touched by your answer.
Nevertheless,well, the 2nd answer make me have a lot on my mind… 
I found you are under deveolping google sheets trigger.
(I found in this article. It is said by @harshil1712 in June 14th, 2021(Profile - harshil1712 - n8n)https://community.n8n.io/t/google-sheets-trigger-new-spreadsheet-row/6253)
- I wonder that the google sheets trigger didn’t complete being developed yet?
I hope to find a new way to make my work flow haha…
If it is not developed yet,
- Could you suggest for me the way to make instant(almost instant is okay) service using google sheets without so many wasting excution count?
Using polling every minutes in 1 month may charge me for 43200 execution.(It is quite wasting that I don’t know whether new data is or not. )
Thank you for reading and answering my questions.