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approximate
not completely accurate but close
empirical
based on experiments or experience rather than ideas or theories
external
connected with or located on the outside of sth/sb
chapter
a separate section of a book, usually with a number or title
magnetic
with the power of a magnet
obtain
to get sth, especially by making an effort
opposite
as different as possible from sth
phase
a stage in a process of change or development
principle
a belief that is accepted as a reason for acting or thinking in a particular way
science
knowledge about the structure and behaviour of the natural and physical world, based on facts that you can prove, for example by experiments
segment
a part of sth that is separate from the other parts or can be considered separately
simultaneous
happening or done at the same time as sth else
technology
scientific knowledge used in practical ways in industry, for example in designing new machines
variation
a change in amount or level
verify
to prove that sth exists or is true, or to make certain that sth is correct
