(20201108)
At the most, we could tell the situation.
Birds calibration:


calibration:　https://dictionary.cambridge.org/dictionary/english/calibration
the units of measurement marked on an instrument so that it can measure accurately:
A fine catheter with 10-mm calibrations was inserted by the surgeon.
At the rear of the heating element is a temperature control dial with calibrations from 1 to 5.
Last part, we could hear someghing artificail, we ensured.