Environmental activist Wu Lihong with petitions against pollution.是什么意思？

Environmental activist Wu Lihong with petitions against pollution.

环境主义者WuLihong请求应对污染问题.

environmental

adj. （个人）环境的，由个人环境产生的，周围的，环境艺术的；

例句
He has attempted to align the Socialists with the environmental movement.
他已试图争取社会党人支持环境运动。

activist

n. 激进主义分子，积极分子，积极行动者；adj. 激进主义的，激进主义分子的；

例句
He's been a trade union activist for many years.
多年来他一直是工会的积极分子.

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

petitions

n. （许多人签名的向当权者提出某种要求的）请愿书( petition的名词复数 )，上诉状，申诉书，申请书；v. 祈求，请求，请愿( petition的第三人称单数 )，（向法庭）请求，申请；

例句
Our repeated petitions have been answered only by repeated injury.
我们屡次的请求,所得到的答复是屡次的伤害.

against

prep. 反对，对…不利，紧靠，以防；

例句
His hand brushed against hers; it could have been either accidental or deliberate.
就在有意无意间，他的手轻轻拂过她的手。

pollution

n. 污染（作用），腐败，堕落，沾污；

例句
The air pollution exceeds most acceptable levels by 10 times or more.
大气污染程度超出了普遍认可的标准10倍或更多。