极为的英文：
(adv) extremely

For joy;for happiness
极为高兴

deadly dull
极为枯燥无味

deadly seriousness
极为严肃的

It answers admirably.
它极为成功。

Irresistible charms
极为诱人的小饰物

Invaluable jewels
极为贵重的宝石

Her choice of words was exact to the nth degree.
她措辞极为准确。

Be enraged at [By] sB.'s conduct
因某人的行为而极为愤怒

She has done me innumerable courtesies.
她对我一直极为有礼。

During the whole of that day there had been an unusual degree of heat in the air, and the sky was heavy with clouds.
那天整天极为炎热，空中布满乌云。

Reasonably adv.
适度地。

Used as an intensifier with adjs or advs that express an extreme opinion.
与表示极度的形容词或副词连用，以加强语气。

Soothingly adv`There,there,' he said soothingly,`Don't distress yourself!'
｀好了,好了,＇他安慰道,｀别伤心了!＇

Co- pref.used fairly widely with adjs,advs,ns and vs
前缀(co)可与许多形容词、副词、名词、动词结合)

(used before advs and adjs in order to make a comparisona)(with the second as a prep)to the same extent...;equally...as
用于副词和形容词之前,以构成比较句型)(第二个as用作介词)达到与...相同的程度;与...等同

in an extremity
智尽力竭|陷入绝境

relative extreme
相对极值

It is extremely corrosive.
它是极强的腐蚀剂。

It was an extremely fine day .
那是一个非常晴朗的日子。

An extremity of a solid is a surface.
立体的边界之一是一个面。