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The word concussion evokes a fear these days more so than it ever has, and I know this personally.
“腦震蕩”一詞從未引起過如此之大的恐慌，我自己也患過腦震蕩，
I played 10 years of football, was struck in the head thousands of times.
我曾打過十年橄欖球，數千次被球打中腦袋，
And I have to tell you, though, what was much worse than that was a pair of bike accidents I had where I suffered concussions,
但我可以告訴你，自行車事故中我遭受的腦震蕩要更為嚴重，
and I'm still dealing with the effects of the most recent one today as I stand in front of you.
現如今當我站在你面前時，我還在從最近的那次腦震蕩中恢復
There is a fear around concussion that does have some evidence behind it.
對腦震蕩的恐懼，有些是有道理的，
There is information that a repeated history of concussion can lead to early dementia,
有證據表明，反復多次腦震蕩，會導致早期癡呆，
such as Alzheimer's, and chronic traumatic encephalopathy.
比如阿耳茨海默氏病，也會導致慢性的創傷性腦病，
That was the subject of the Will Smith movie "Concussion."
這是威爾·史密斯主演的電影《震蕩效應》的主題，
And so everybody is caught up in football and what they see in the military,
幾乎每個人在橄欖球比賽中，或是在部隊里，都會遭受腦震蕩，
but you may not know that bike riding is the leading cause of concussion for kids, sports-related concussion, that is.
但你可能不知道，對孩子們而言，騎自行車才是腦震蕩的主要成因，即運動相關腦震蕩，
And so another thing that I should tell you that you may not know is that
我還想告訴在座各位一件事，你們或許也不知道，
the helmets that are worn in bicycling and football and many activities,
諸如自行車和橄欖球等運動，所規定佩戴的頭盔，
they're not designed or tested for how well they can protect your children against concussion.
并不是為了防止或減輕腦震蕩而設計的，
They're in fact designed and tested for their ability to protect against skull fracture.
事實上，此類頭盔的目的在于保護頭骨，預防頭骨骨折。
