that's the way it is; such is life
study; research; investigation
cell; cell (in an organization, esp. a communist party)
interference; intervention; meddling
individual; private person; personal; private
without; but if; otherwise; or else
advanced student; advanced learner; advanced practitioner; experienced person
intended for ...; oriented towards ...; aimed at ...
fallen scraps; scatterings; leftovers; remainder; student who cannot keep up in school; dropout (from school, society, a movement, etc.)
it is assuredly that ...; can say with confidence that ...
to withstand; to be able to endure
study; diligence; discount; reduction
you have only to; all you have to (do); all that's required; as long as; if only
all people; everybody; ten thousand people
technology; engineering; technique; skill; art; craft
as expected; sure enough; after all (is said and done); in the end; too; also
emotional strength; force of will
or; either ... or; maybe; perhaps; some ... and others ...; sometimes ... and at other times ...
vitality; (one's) life force
exceedingly; extremely; decisively
very small amount; insignificant thing; negligible amount
no more than; just; only; mere; goes no further than
most important condition (for); first prerequisite
official; formal; formula (e.g. mathematical); official (social media) account (of a company, organization, etc.)
(practical) application; putting to practical use; applied
clause; article; stipulations
to be unable to; to find difficult (unpleasant, awkward, painful) to do; to serve two or more functions or roles simultaneously; to contain (or combine) two or more features; to work in two or more jobs simultaneously (positions, etc.); to do alongside
general idea; concept; notion
hard to understand; Byzantine fashion
in; on; at (place); as for; regarding
distinction; difference; separate; different; exception; exclusion
dimension; perspective; point of reference; level (of something)
exchange (e.g. cultural); interchange; interaction; alternating current; AC
race; tribe; species; genus; stellar population (i.e. population I, II and III)
ground; earth; the solid earth; the (vast) land
coexistence; living together; symbiosis; paragenesis
setting (someone) to work; employment; using; causative (verb, etc.)
assistance; support; subsidy; supplement; auxiliary; subsidiary