4.18

（1）symmetrical

a.对称的

eg.The plan of the ground floor is completely symmetrical.

(2)humid

a.潮湿的

eg.The island is hot and humid in the summer.

(3)corrode

v.使腐蚀，侵害，迫害

corrosive a.腐蚀性的

eg.Acid corrodes metal.

(4)coup

n.怦然的一击，妙计，出乎意料的行动

eg.to state /mount a coup

(5)aggravate

vt.使聚集，收集，总计，总和

a.总计的

n.总数，合计

in the aggregate 总共

eg.But in the aggregate,it can take out an entire building.

(6)airborne

a.空运的，空降的，飞行中的

eg.Do not leave your seat until the plane is airborne.

(7)aisle

n.通道，走廊

He followed the usher down the aisle.

(8)alienate

vt.使疏远，离间，转让

eg.He alienated hia wife by his cruelty to her.

(9)allege

vt.宣称，断言

eg.The teacher alleged that the student  might have cheated on the exam,but the sthdent asserted that he had not cheated.

(10)allegedly

ad.据称，据指控

eg.He is allegedly a police secret agent.