infrastructure与construction还有concern是什么意思？

infrastructure
n.1.公共建设(如铁路、公路、下水道等)
2.基础建设

construction
n.1.建造,建设;建造术[U]
The new school is still under construction.
新学校还在建造中。
2.建筑物,建造物[C]
The building is a construction of wood.
这是木质结构的建筑。
3.【语】句法关系,句法结构[C]
You will soon learn when to use this kind of construction.
你不久就会学会何时该用这种句法结构。
4.解释,意义[C]
Let's put a good construction on her conduct first.
让我们对她的行为先作一个善意的解释吧。

concern
vt.(不用被动语态)关于
1.涉及,关系到;影响到
The letter is chiefly concerned with export commodities.
这封信主要是关于出口商品的。
2.使担心;使不安[H][(+about/for)]
The boy's poor health concerned his parents.
那男孩健康状况不佳,使他的父母亲忧虑。
3.使关心[H][(+about/with)]
He was very concerned about her.
他对她非常关心。
n. 1.关心的事,重要的事[C]
That's no concern of mine.
那不关我的事。
2.关系;利害关系[C][U][(+with/in)]
3.担心,挂念;关怀[U][C][(+about/for)]
Andrew expressed his concern.