artificial; man-made; imitation; synthetic
belongings; appendage; accessory
to polish up (on); to refine; to hone; to polish (by rubbing)
to succeed in doing; to manage to do; to finish doing
cavern; cave; cave system; grotto
semi-manual (e.g. manufacture)
blue (colour, color); sad; down (in the dumps)
one theory (opinion); another theory (opinion)
rapid economic growth (esp. that of Japan in the post-WWII period)
subway; tube; underground railroad; underground railway
bank; weir; embankment; levee
oasis; OASYS (Fujitsu WP system)
detached territory; enclave; exclave; scattered landholdings
to suspend between two points; to build (a bridge, etc.); to put up on something (e.g. legs up on table)
after all; anyway; actually; well, ...; ... on earth (e.g. "what on earth?"); ... in the world (e.g. "why in the world?")
major powers of the world; great powers
continuous; sustained; sustainable; durable; persistent
being dotted with; being scattered
to connect; to join; to join or tie or knot together
economic bloc; ecosystem (of services, goods, etc. within a company or consortium)
per person; per capita; per head
gross national product; GNP
to be as plain as daylight; to be as clear as day
technical civilization; technical civilisation
to be ready and waiting for; to be on the alert for