[250-145] laborious
adj.费力的，艰难的(arduous, painstaking)[250-145] precipitous
adj.陡峭的，急躁的(sheer, extremely steep)[250-145] devious
adj.曲折的(circuitous)[250-145] arduous
adj.险峻的，困难的(difficult, strenuous, laborious, backbreaking)[251-145] strenuous
adj.辛苦的(energetic, laborious)[251-145] plight
n.(恶劣的)情势，困境(predicament, dilemma)[251-145] strait
n.困难[251-145] painstaking
n.辛劳adj.劳苦的(careful, scrupulous)