* fencing

n. 击剑

* frost

n. 严寒；霜

* defrost

v. 除去(某物)的冰或霜；解冻

defrost the fridge, the car windscreen

给冰箱、汽车挡风玻璃除霜。

A frozen chicken should be allowed to defrost completely before cooking.

冻鸡应彻底解冻後再烹调。

* forest

n. 森林

* deforest

v. 砍掉……森林，毁掉……森林

Two thirds of the region has been deforested in the past decade.

在过去十年里这个地区的森林有三分之二被毁掉。

* defend

v. 防卫

a struggle to defend our homeland

保卫我们祖国的斗争

the need to defend democracy against fascism

保卫民主、反抗法西斯的需要

* defender

n. 防守队员，后卫；保卫者

It's his fourth season as an Arsenal defender.

这是他成为阿森纳队后卫之后踢的第四个赛季。

He presented himself as a defender of democracy.

他以民主捍卫者的姿态出现。

* defense

n. 防御，保护

soldiers who died in defense of their country

为保卫祖国而献身的战士

When her brother was criticized she leapt to his defense.

她的兄弟受到批评时，她马上跳出来衞护。

* defensive

a. 防御性的，防御用的

The prince drew up his forces in a strong defensive position.

亲王将部队布成坚固的防御阵势。

The rockets are a purely defensive measure against nuclear attack.

火箭纯粹是针对核攻击的防御性措施。