eternal; everlasting; unchangeable; invariant
unit; denomination; credit (in school); in units of (e.g. "in thousands"); in amounts of
nature; the natural world; realm of nature
unless one ...; if one does not ...
untrodden (region, field of study, etc.); unprecedented (discovery, achievement, etc.)
experiential; empirical; experimental
to step into (e.g. someone else's territory); to break into; to raid; to come to grips with; to get to the core of
although; despite; whereas; while; if only; I wish
bishop (chess piece); bishop
general idea; concept; notion
to represent; to signify; to reveal; to show; to express; to make widely known
isn't it?; let's ...; why don't we ...; how about we ...
and yet; despite this; but even so; but even then; however; nevertheless
actually; really; truly; in practice; practically
(practical) application; putting to practical use; applied
thought; thinking; contemplation; using wisdom to get to the bottom of things; focusing one's mind; deep contemplation
deflation; contraction; shrinking; constriction
physical science; natural science; physics; lixue (Song-era Chinese philosophy); (arch.) philosophy
life; living; I; me; student
to think; to consider; to think (of doing); to plan (to do); to judge; to assess; to imagine
fourth dimension; four dimensions
solid body; three-dimensional object; multi-storey car park
permeation (of thought, ideology, culture, etc.); infiltration (e.g. of ideas); permeation (of a liquid, etc.); soaking; osmosis
vacant space; aperture; gap; opening
analysis; analytical study; parsing; parse
outer canthus; outer corner of the eye
to play (a stringed or keyboard instrument)
inference; deduction; induction; reasoning
showy; brilliant; gorgeous; florid; gay
hypothesis; supposition; assumption; tentative theory