one (esp. of two); the other; one way; on the other hand
trial product; prototype model
reason; cause; history; origin
angrily; in a huff; high on marijuana; tender (to chew)
of uncertain meaning; ambiguous; cryptic; nonsensical; incomprehensible; perplexing
to need; to demand; to take; to require
advanced materials; new high-tech materials
fall; decline; lowering; deterioration; degradation
burden; load (e.g. CPU time, electricity, etc.)
stoppage; coming to a stop; ceasing (movement, activity, etc.); suspension (of operations); suspension (of payment, licence, etc.); (temporary) prohibition
casual; doing something without taking it too seriously
exhibition hall (room, area)
study tour; guided visit; field trip
how many years; how long; what year
one by one; one each; one at a time
for a long time; since long ago; always; already; far in advance (e.g. reservation)
to cross; to go across; to go through; to cut across
farm (livestock); stock farm; ranch; pasture; meadow; grazing land
arbor; arbour; bower; summer house; square gazebo
madness; insanity; irregularity; deviation; fanaticism; fanatic
unexpected meeting; coincidence
upper stream; upper course; upstream; upper classes
to live; to reside; to inhabit
patriarch; head of a family
then; and then; and; if so; because then; if that's the case
river management; river improvement; flood control
to cramp; to be cramped; to contract
friend; companion; acquaintance; friendship; companionship
judging from; on the basis of; from the point of view of
modest; reserved; quiet; humble
might as well; sure, why not; why not use this occasion to ...
to pile up; to heap up; to stack up; to repeat many times over; to go through repeatedly; to accumulate
to be piled up; to lie on top of one another; to come one after another; to happen over and over; to overlap (each other); to occur at the same time
invincible; unrivaled; unrivalled; matchless; unbeatable; undefeatable
within; inside of; less than