return gift; return favour (favor); revenge; change (in a cash transaction)
now; the present time; just now; another; more
formidable enemy; strong enemy; tough enemy
special training; intensive training; crash course
to tear; to rip; to break through (cordon, opponent's defense, etc.); to breach; to defeat; to beat; to break (e.g. silence)
the future (usually distant); future tense; the world to come
to protect; to guard; to defend; to keep (i.e. a promise); to abide (by the rules); to observe
time; hour; period; class
only; merely; but; no more than
downfall; ruin; collapse; destruction
artificial; man-made; human work; human skill; artificiality
cell; cell (in an organization, esp. a communist party)
to steal; to plagiarize; to steal (a technique, idea, etc.); to do stealthily; to do during scant time; to steal a base
cooperation; collaboration
snare; trap (for catching wild game, etc.); trap (i.e. ruse, subterfuge, etc.)