The adverb of degree 极为 “extremely”
Adverbs of degree (程度副词) are used to intensify or modify the degree of an adjective (or verb): very, really, extremely.
We use the adverb 极为 
to express an extreme degree of a feeling or an attribute.
We should put it before an adjective or a verb.
to express an extreme degree of a feeling or an attribute.
We should put it before an adjective or a verb.Examples
齐白石是极为杰出的画家
Qi Baishi is an outstanding painter
qíbáishí shì jíwéi jiéchū de huàjiā
这事极为重要
This is extremely important
zhè shì jíwéi zhòngyào
环境问题人们极为关注
Environmental issues are of great concern to people
huánjìng wèntí rénmen jíwéi guānzhù