omnivorous ADJ. /无所不吃的;杂食的/eating both plant and animal food; devouring everything. Some animals,
including man, are omnivorous and eat both meat and vegetables; others are either carnivorous or herbivorous.
onerous ADJ. /范忠德/burdensome. He asked for an assistant because his work load was too onerous.
onset N. /开始，发作，肇端;攻击/beginning; attack. Caught unprepared by the sudden onset of the storm, we rushed
around the house closing windows and bringing the garden furniture into shelter. Caught unprepared by the enemy onset, the troops scrambled to take shelter.
onus N. /负担;责任/burden; responsibility. The emperor was spared the onus of signing the surrender papers; instead,
he relegated the assignment to his generals.
opalescent ADJ. /乳白的/iridescent; lustrous. The oil slick on the water had an opalescent, rainbow-like sheen. opaque ADJ. /暗的;不透明的/dark; not transparent. The opaque window shade kept the sunlight out of the room. opacity,
opiate N. /鸦片剂;安眠的，止痛的/medicine to induce sleep or deaden pain; something that relieves emotions or causes
inaction. To say that religion is the opiate of the people is to condemn religion as a drug that keeps the people quiet and submissive to those in power.
opportune ADJ. /世纪恰巧的;刚好的/timely; well-chosen. Sally. looked at her father struggling to balance his checkbook;
clearly this would not be an opportune moment to ask him for a raise in her allowance.
opportunist N. /机会主义者/individual who sacrifices principles for expediency by taking advantage of circumstances.
Joe is such an opportunist that he tripled the price of bottled water at his store as soon as the earthquake struck. Because it can break water pipes, an earthquake is, to most people, a disaster; to Joe, it was an opportunity.
optician N. /眼镜商/maker and seller of eyeglasses. The patient took the prescription given him by his oculist to the
optician.
optimist N. /乐观者/person who looks on the good side. The pessimist says the glass is half-empty; the optimist says
it is half-full.
optimum ADJ. /最优的/most favorable. If you wait for the optimum moment to act, you may never begin your project.
also N.
optional ADJ. /可选的/not obligatory; left to one's choice. Most colleges require applicants to submit SAT I scores; at
some colleges, however, submitting SAT I scores is optional.
opulence N. /奢华;巨富;富裕，富足/extreme wealth; luxuriousness; abundance. The glitter and opulence of the ballroom
took Cinderella's breath away. opulent,ADJ.
opus N. /作品/work. Although many critics hailed his Fifth Symphony as his major work, he did not regard it as his
major opus.
oracular ADJ. /神一样的;谜一样的;超自然的，无法理解的/prophetic; uttered as if with divine authority; mysterious or
ambiguous. Like many others who sought divine guidance from the oracle at Delphi, Oedipus could not understand the enigmatic oracular warning he received.
orator N. /演讲者/public speaker. The abolitionist Frederick Douglass was a brilliant orator whose speeches brought
home to his audience the evils of slavery.
ordain V. /指定;规定;任命;命令/decree or command; grant holy orders; predestine. The king ordained that no foreigner
should be allowed to enter the city. The Bishop of Michigan ordained David a deacon in the Episcopal Church. The young lovers felt that fate had ordained their meeting.
ordeal N. /严酷的考验;折磨/severe trial or affliction. June was so painfully shy that it was an ordeal for her to speak up
when the teacher called on her in class.
ordinance N. /法令;政令/decree. Passing a red light is a violation of a city ordinance.
ordination N. /圣职授任;委任/ceremony making someone a minister. At the young priest's ordination, the members of
the congregation presented him with a set of vestments. ordain
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