defense; defence; safeguard; protection
to go by; to go past; to run (between; of a rail service, bus route, etc.); to operate (between); to go indoors; to go into a room; to penetrate
monitoring; watching; observation; surveillance; guarding; supervision
unusual; uncommon; extraordinary; out of the ordinary; incomparable; serious
tidal hour; right time; favourable opportunity (favorable)
(not) so; (not) particularly; (not) very; (not) that much
like this; this sort; this way
great achievement; great feat; great work; great undertaking
forever; for good; eternally; as long as one likes; indefinitely; no matter what
to keep (something) a secret; to keep hidden (for ever); to continue to conceal
it is not possible (to, that); there is no such thing as
to be brought forward (e.g. by three hours); to be moved up; to be hasty; to be rash; to quicken; to speed up
at last; finally; barely; narrowly; just
imprudence; indiscretion; thoughtlessness
to be on track; to be going to plan; to enter orbit
laboratory; seminar room; professor's office
to throw away; to cast away; to abandon; to desert; to give up; to resign
irritating; aggravating; upsetting
reserve; spare; preparation; preliminaries
to throw into disorder; to disarrange; to disturb (order, peace, etc.); to corrupt (public morals); to dishevel (hair)
to talk to oneself; to mutter
scorn; disdain; contempt; slight
target; object (of worship, study, etc.); subject (of taxation, etc.)
to put one's life on the line; to risk one's life; to put everything one has into it
infiltration; sneaking in; going undercover
illegal digging; illegal mining; grave robbing; tomb robbing
savage; barbarous; barbaric; uncivilized; uncivilised
to be soaked in; to be flooded; to be submerged; to be immersed in (joy, memories, alcohol, etc.); to give oneself over to; to bask in
elevation; rise; improvement; advancement; progress
not yet known; unknown; strange
grace; favor; favour; blessing; benefit
to look as if one is important; to swagger around
few decades; many decades; several decades
several times (as large, over)
just a handful; only a small number (of)
evacuation; withdrawal; revocation; repeal; retreat