看了一下原文
https://www.iihs.org/news/detail/iihs-researchers-find-little-benefit-from-kne
e-airbags
Airbags are essential, lifesaving devices that have prevented tens of thousand
s of deaths. More airbags, one might assume, would provide even greater protec
tion.
汽车安全气囊是一个拯救数万人的安全设备。
人们可以推论，安全气囊越多，防护能力越好。
That isn’t always the case, a recent IIHS study shows. One increasingly commo
n type of airbag — the knee airbag — has a negligible effect on injury risk
and, in fact, may even increase it in some cases, researchers found.
但是最近IIHS对于现在越来越常见的膝部气囊的研究表露了不同于一般的结果。
研究指出膝部气囊对于降低受伤风险是微不足道的，甚至在特定的案例中有增加受伤机率
的风险
Knee airbags usually deploy from the lower dashboard and are intended to distr
ibute impact forces to reduce leg injuries. They may also help reduce forces o
n an occupant's chest and abdomen by controlling lower body movement.
膝部气囊作用于仪表板下方
可以分散下方的冲击力道减少腿部受伤的情形
甚至有可能在冲击中
借由控制下半身在冲击中的运动
来减轻人员胸腹部的压力
To find out if knee airbags improve safety, IIHS researchers examined both cra
sh test data and information from real-world crash reports.
为了了解膝部气囊实际引响，IIHS的研究人员
检视了撞击测试跟现实车祸的资料
For the first part, they looked at injury measures from more than 400 frontal
crash tests conducted as part of the IIHS vehicle ratings program to see if in
juries were less likely when vehicles were equipped with knee airbags.
低一部分：
在撞击测试方面
IIHS检视了超过400笔自己所进行的前方撞击测试
来比对装配了膝部气囊的汽车是否真的能降低受伤机率
To look at real-world outcomes, they compiled crash reports from 14 states and
compared injury risk in vehicles with knee airbags with risk in vehicles with
out knee airbags.
而现实车祸方面
IIHS则收集了北美14州的车祸资料
来比对有装备膝部气囊的车跟没装配膝部气囊的车的受伤机率
Knee airbags had only a small effect on injury measures recorded by dummies in
IIHS driver-side small overlap front and moderate overlap front crash tests.
In the small overlap test, knee airbags were associated with increased injury
risk for lower leg injuries and right femur injuries, though head injury risk
was slightly reduced. The airbags had no effect on injury measures in the mod
erate overlap test.
结果表明
再撞击测试中
膝部气囊对于前方撞击的影响非常有限
在驾驶侧小面积撞击中
膝部气囊会增加小腿以及右股骨的受伤风险
但是头部受伤的风险确些微减少
然而在40%中等撞击测试中则没明显影响。
In the analysis of real-world crashes, knee airbags reduced overall injury ris
k by half a percentage point, from 7.9 percent to 7.4 percent, but this result
wasn’t statistically significant.
然后，在实际车祸中
膝部气囊让平均受伤机率从7.9%减少至7.4%
一共减少了0.5个百分点
但是这个些微的差距并没统计上的意义
“There are many different design strategies for protecting against the kind o
f leg and foot injuries that knee airbags are meant to address,” says Becky M
ueller, an IIHS senior research engineer and co-author of the paper. “Other o
ptions may be just as, if not more, effective.”
本研究的共同作者，IIHS的资深研究人员Becky Mueller指出
”除了膝部气囊外，还有很多设计能减少腿部伤害”
”其它的设计也一样有效”
One reason some manufacturers have been installing knee airbags is to help veh
icles pass federally mandated tests with unbelted dummies. It’s possible that
knee airbags would help unbelted occupants in real-world crashes. The IIHS st
udy didn’t look specifically at crashes in which people weren’t using seat b
elts, and dummies are always belted in IIHS vehicle ratings tests.
有些厂商装置膝部气囊的主要原因是希望自己的车辆能够通过未系安全带的联邦测试
在现实车祸中
膝部气囊或许有能力降低未系安全的乘客受伤风险
但在IIHS的现实车祸资料中
并没有精细研究未系安全带跟有系安全带的差别。
而在实验室撞侧中，所有假人都是有系上安全带的
心得：
感觉原文的意思是气囊数并不一定是选车的重要指标，而膝部气囊的影响并不大
或许是google翻译不准
感觉文章只是叙事，没有太多起伏