industry — the aggregate of manufacturing or technically productive enterprises in a particular field, often named after its principal product: the automobile industry; the steel industry.
operation — an act or instance, process, or manner of functioning or operating.
strain — to draw tight or taut, especially to the utmost tension; stretch to the full: to strain a rope.
stretch — to draw out or extend (oneself, a body, limbs, wings, etc.) to the full length or extent (often followed by out): to stretch oneself out on the ground.
striving — to exert oneself vigorously; try hard: He strove to make himself understood.
struggle — to contend with an adversary or opposing force.
travail — painfully difficult or burdensome work; toil.
trial — German Der Prozess. a novel (1925) by Franz Kafka.
trouble — to disturb the mental calm and contentment of; worry; distress; agitate.
use — to employ for some purpose; put into service; make use of: to use a knife.