Similarly, over the last 30 years flame-retardant chemicals known as polybrominated diphenyl ethers (PBDEs) have been widely used, although little is known about their broader effects.

• 类似地，在过去的30年里，像我们知道的多溴二苯醚（PBDEs）等阻燃化学药剂也被广泛应用，但我们并不了解它们具有的其他功能。