surface of the earth; ground surface
vast; extensive; immense; huge; large; grand
gravity; gravitation; gravitational pull
Eurasian continent; Eurasia
population (of animals, etc.); population size; number of individuals
thinning out; pruning; culling; infanticide
periodic; regular; routine
advance (into a new market, industry, etc.); expansion (into); launch (into); advance (to the next round of a competition)
being settled; coming to a conclusion
shaft (e.g. in a mine); pit
reactor; reacting furnace
along (a wall, river, railroad tracks, etc.); alongside; following
relocation (of facilities, an institution, factory, etc.); moving (to a different site)
numerical value; figure; result; reading (on a meter, etc.)
average value; mean value; mean; expectation
heeding; paying attention; bearing in mind
classification; categorization; sorting
comparatively; quite; rather; rate; ratio; percentage
hall; saloon; spacious room; reception room
development; growth; progress; development; expansion (of a typhoon, low-pressure area, etc.); developmental disability
inner structure; internal anatomy
nest; rookery; den; haunt; (spider's) web
land, sea and air; army, navy and air force
accommodation; taking in; imprisonment; detention; containing (e.g. words in a dictionary); adding
hole; opening; pit; hollow; burrow; den; deficit
to have a hole; to be pierced (with a hole)
large quantity; massive (quantity); mass (e.g. mass production, mass transit, mass destruction)
breaking down; defeating; abolishing
shell (e.g. electron shell)