四级词汇

Legal membership of a nation; a people sharing common culture or origin

国籍；民族

The direct light and warmth of the sun; cheerfulness or happiness

阳光；欢乐，开朗

Of three dimensions or the third power; a cubic curve

立方的，三维的；三次曲线

A person who makes or alters clothes; to adapt something for a specific need

裁缝；量身定制，专门调整

To make or become brighter or more cheerful

使变亮；使振奋，使愉快

The number 19

十九；数字19

In the middle of or within a group

在……当中，在……之间

To calculate or process data mathematically

计算，估算

The ability to fully understand something

理解，理解力

The branch of mathematics dealing with spatial relationships and shapes

几何学

A rounded handle, control switch, or protuberance

圆形把手，旋钮，球形突起

A flat inscribed slab; a small pill; a portable touchscreen computer

石板；药片；平板电脑

To change from liquid into vapour; to disappear gradually

蒸发；消散

The number 70

七十；数字70

Emitting ionizing radiation from unstable atomic nuclei

放射性的；有辐射的

A team sport played by hitting a ball over a net; the ball used

排球运动；排球

Rough in texture; crude or lacking refinement

粗糙的；粗俗的

The way a word is spelled; the practice of forming words correctly with letters

拼写；拼法；拼字

The science and practice of flying aircraft

航空，航空学

A bird of prey; a person favouring aggressive policies; to sell goods in public

鹰；鹰派人物；叫卖，兜售

Without hope or chance of success; unskilled

绝望的；没有希望的；不擅长的

To attach or secure firmly in place

拴紧，系牢，扣上，固定

To rot or deteriorate; the process of decomposition or decline

腐烂；衰退；腐败

A female chicken or other female bird

母鸡；雌禽

To protect from loss or waste; a fruit jam or preserve

保护，节约；果酱，蜜饯

For a particular purpose or person; in a special way

特别地，专门地

Long-lasting and resistant to wear or decay

耐用的，持久的

A device for finding direction; range or scope

指南针；圆规；范围

The beginning or start of something

开始，开端

To establish or start; an organization promoting education or science

建立，创立；学会，学院

A common city bird; a person easily deceived

鸽子；容易上当受骗的人

A boundary or limit; obliged to do something; to leap forward

边界，界限；有义务的；跳跃

The act of speeding up; the rate of change of velocity

加速，加速度

The distance between wave peaks; a shared way of thinking

波长；思维上的共鸣

A statement of money owed for goods or services; A draft of a proposed law; A banknote; The beak of a bird; To send a bill to; to announce (with posters)

账单、 清单、 钞票；议案、 法案；鸟喙；开账单、 (用招贴)宣布

The clawed foot of an animal; to touch or scrape with a paw

（动物的）爪；用爪子抓

To spin or rotate rapidly; a rapid spinning movement

旋转，急转；混乱纷乱

To remove or erase data or text; a key for removing data

删除；删除键

A large bright fire; to burn or shine brilliantly

烈火，火焰；熊熊燃烧

A skilled woodworker who builds with timber; to do carpentry work

木匠，木工；做木工活

Following one after another in sequence

连续的；依次的

In an opposite or reversed way

相反地，反过来说

A small baked good; a cookie or soft bread roll

饼干（英式）；小圆面包（美式）

A trainee gaining practical experience; to detain without trial

实习生；拘留，扣押

Agreement or conformity with rules or standards

一致；符合；和谐

The loud rumbling sound caused by lightning; to make a deep rumbling noise

雷声，轰隆声；打雷，轰隆作响

A steep flow of water over a cliff edge

瀑布

A naturally occurring flammable liquid consisting mainly of hydrocarbons; crude oil

石油，原油