YOU SAID:
My xylophone didn't comprehend the accuracy of the measurement
INTO JAPANESE
木琴は、測定の精度を理解しませんでした
BACK INTO ENGLISH
Xylophone did not understand the accuracy of the measurement
INTO JAPANESE
木琴は、測定の精度を理解していませんでした
BACK INTO ENGLISH
Xylophone did not understand the accuracy of the measurement
You've done this before, haven't you.