Toxicologists attempt to identify and understand toxic hazards.是什么意思？

Toxicologists attempt to identify and understand toxic hazards.

毒理学家试图找出并了解毒害风险。

attempt

vt. 试图，尝试；n. 进攻，尝试，冲击；

例句
The authorities have abandoned any attempt to distribute food...
当局中止了分发食物的尝试。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

identify

vt. 识别，认出，确定，使参与，把…看成一样；vi. 确定，认

例句
Children can be seen to copy the behaviour of others whom they admire or identify with...
人们发现儿童会模仿他们所崇拜或有共鸣感的人。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

understand

vt.& vi. 懂，理解；vt. 了解，默认，听说，领会；

例句
Another accusation levelled at the Minister is that he does not understand ordinary people...
另一个矛头则直指部长不懂得体恤百姓。

toxic

adj. 有毒的，中毒的，因中毒引起的；n. 毒物，毒剂；

例句
Lead can accumulate in the body until toxic levels are reached.
铅会在体内积聚直至造成铅中毒。

hazards

n. 危险( hazard的名词复数 )，冒险的事，危害物，危险的根源；v. 冒险做（无把握之事）( hazard的第三人称单数 )，冒险做出，尝试着做[提出]，冒…的风险；

例句
It protects against environmental hazards such as wind and sun...
它可以保护免受风、太阳等环境因素的危害。