Helicopters take crews to the scene of wildfires and tankers drop flame retardant from the air.

直升机将人员带到野火现场，灭火飞机从空中投掷剂。

" First it needs to identify those flame retardants – some of them are toxic, " he says.

“首先，它需要识别那些剂——其中一些是有毒，”他说。

Fire retardants are materials that can stop or slow the spread of fires.

防火剂这种物质可以止或者减缓火势蔓延。

The fire retardant cost those two years reached nearly $200 million.

这两年所使用剂成本达到了近2亿美元。

Planes poured retardant on the fire from above, while firefighters battled the inferno on the ground.

飞机从空中向这场大火倾倒剂，消防队员则地面上火海中搏斗。

Or fire retardants are a big problem these days. We're not sure what the problems are.

也许现剂也是一个大问题。但是我们不确定是什么问题。

Hundreds of firefighters fought the fire on the ground and planes dropped water and retardant from above.

数百名消防队员地面救火，飞机从空中降下水和剂。

In 2020, The Forest Service used more than 190 million liters of retardant for the first time.

2020年，美国林业局首次使用了超过1。9亿升剂。

Tankers whisking above the tree line, dumping retardant by the thousands of gallons to meet the advancing flames.

倾倒机树木上方呼啸而过，将数千加仑剂倾泻下来，以应对不断蔓延火势。

Fortress says its retardants are effective and better for the environment than other products.

Fortress公司表示，其生产剂比其他产品更有效，更环保。

But two nonprofit groups say both kinds of retardant harm the environment.

但两家非营利组织表示，这两种剂都会对环境造成危害。

One fire burned much of the city to rubble and ash covered by the red fire retardant you see in these pictures.

一场大火把城市大部分地区烧成了瓦砾和灰烬，上面覆盖着红色剂，你这些照片中能够看到。

Both said that the ammonium-phosphates-based retardant is a fertilizer that can help invasive plants.

两人都表示，基于磷酸铵剂是一种有利于入侵植物生长肥料。

It can form lightweight fibers that can be woven into fabric, and it's famously flame retardant.

它可以形成可以织成织物轻质纤维，并且以性着称。

They now add ingredients such as stabilizers and flame retardants.

他们现添加了稳定剂和剂等成分。

Just in case, you are going to buy a fire retardant suit, too.

以防万一， 你也要买一套防火服。

They are spraying and dropping water, as well as fire retardant, in the affected areas.

他们受灾地区喷洒水和剂。

But critics say the Forest Service should be spending less on these mixtures known as fire retardants and more on firefighters.

但批评人士表示，美国林业局应该减少这些被称为剂混合物上支出，而要增加消防员身上支出。

They are worried about the possible harm the retardants could cause to aquatic species.

他们担心这两种剂可能会对水生物种造成伤害。

The groups suggest that the U.S. Forest Service should be spending less on fire retardant and more on firefighters.

这些组织建议美国林业局应该减少剂上支出，增加消防员身上支出。