assertive – adj. confident in behavior or style

bitter – adj. having a strong and often unpleasant flavor that is the opposite of sweet

citrus – n. a juicy fruit such as an orange, grapefruit, or lemon that has a thick skin and that comes from a tree or shrub that grows in warm areas

synthesize – v. to make something from simpler substances through a chemical process

vector – n. an insect, animal, etc., that carries germs that cause disease
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