an object used to help in work
an object, such as piano, horn, etc.
sb/sth which seems to be used by an outside force
"my greed was the instrument of my destruction"
"science has given us new tools to fight disease"
The Cabinet..had already become the fundamental administrative instrument.
出自： H. J. Laski
For self-study the material is experience, the instrument judgment.
出自： D. M. Frame