1 concern不能用作形容词，它可以作动词或名词，译为 涉及，影响，关心，关爱等。concern的形容词是concerned。
2 concerned表示担心的,忧虑的. 常用的词组搭配有:be concerned about对……关心 例如 I am concerned about the health of my children . be concerned with与……有关。 The question is concerned with the development of the city.