2011看雅思文章，背雅思词汇（3）

1.the fourth letter of the Greek alphabet(Δ,δ)希腊字母表的第四个字母。

2.triangular area of alluvial land at a river’s mouth, enclosed or crossed by branches of the rivers.（河口的）三角洲

the Nile Delta 尼罗河三角洲

 [ZK2]wear sth. down: (causing sth to) become gradually smaller, thinner, etc.使某物逐渐变小，变细，变薄等。

 [ZK3]outline:

1.lines showing the shape or outer edge of sth.轮廓，外形

She could see only the outlines of the trees in the dim light. 朦胧中，她只看到树木的轮廓。

2.statement of the main facts or points要点，大纲，摘要

an outline of an essay/ a lecture

 [ZK4]dramatic:

1.of drama.戏剧的

a dramatic society 戏剧协会

2. exciting or impressive 戏剧性的，激动人心的，给人深刻印象的

dramatic changes, development, news 激动人心的变化，发展，新闻

 [ZK5]fluctuate

[;flVktSu'eiSn] n.变化，波动

wide fluctuations of temperature. 温度的巨大变化

 [ZK6]hectare['hekteE]

measure of area in the metric system, equal to 100 ares or 10000 square metres. 公顷