不少: many, a lot, not few...
染: to dye, to catch (a disease), to acquire (bad habits etc), to contaminate, to add color washes to a painting...
学期: term, semester...
纤维: fiber...
药品: medicaments, medicine, drug...
害虫: injurious insect, pest...
沙漠: desert...
消灭: to put an end to, to annihilate, to cause to perish, to perish, annihilation (in quantum field theory)...
录: diary, record, to hit, to copy...
刺激: to provoke, to irritate, to upset, to stimulate, to excite, irritant...
