He got one seven years ago to help recover from a back injury.

Occupational risk factors including sitting, whole body vibration, bending/ twisting, lifting and heavy work were investigated to calculate exposure index by weighing employment years, family history of lumbar disc diseases and back injury history were also concerned.

问卷调查腰椎疾患家族史、腰背部受伤史和5种职业危险因素的暴露情况，包括坐位、全身振动、弯腰扭腰、提举重物和重体力作业，对各因素暴露以工龄权重求得暴露指数。

The associated risk factors of back pain consisted of age, flying hours, flying model, history of back injury, and abnormal psychological behavious.

相关危险因素有：年龄，飞行时间，飞行机种，腰伤史和心理因素。

So why do Japanese go KFC crazy come Christmas? Well, apparently the idea came from an expat customer back in the day who said he was eating KFC for Christmas because turkey doesn't exist in Japan.

那么，为什么日本人会在圣诞节蜂拥前往肯德基呢？很明显，这个现象的出现源于这样一个典故：一个亡命到日本的顾客说他要在圣诞节这一天吃肯德基，因为日本没有火鸡。

Back in the day when she still lived she predicted a few things, one of them was that WW3 would begin in November 2010.She is also well known for things she predicted that already came true.

她准确地预言过一些事情。当年她还活着的时候，她预言了一些事情，其中一件是2010年11月将爆发第三次世界大战。她因为某些预言真的应验而闻名。

Just as whites marched with Martin Luther King back in the day, there are plenty of men who genuinely give a damn about women's rights.

就像白人曾经与马丁·路德·金一同游行，也有很多男人真心在乎女性的权利。

And if that is the case, few can oppose the theory that aliens did indeed populate or at least help Egypt back in the day.

如果真是这样的话，就没有人能否定当时有外星人居住过或者至少帮助过古埃及人。

Back in the day, manufactures used to insert stiffening cards into their paper cigarette packs, to make them sturdier and last more;

当时，厂商习惯在香烟纸包装里插入硬卡片，使包装更坚固、使用时间更长。

Oh, uh, I, I like shooting guns, and uh... Back in the day of the western most famous.

这个最经典的西部片我喜欢开枪射击

Back in the day, reviews of the app said that is was a very innovative media player, although a bit buggy.

那个时候，软件的评论都表示尽管有一点不完善，但不可否认是一个非常创新的媒体播放器。

Or the... or The Cardigans, back in the day, when they... when they first came to America?

或是羊毛衫合唱团回到他们刚来美国的…那个黄金时代

Back in the day, WML/ WAP apps were hard to use and very limited in functionality.

想当初，WML/WAP应用就很难使用，功能也很有限。

I have been told that there are1 or2 teachers still left in shanghai from back in the day.

有人告诉我，仍有一两个当年的老师还住在上海。

He would tell me I was so lucky, because back in the day he had to walk five miles to school.

我父亲常对我说，他小时候上学要走很远的路。现在的孩子们就幸福多了，可以坐校车。

I hear you were a heck of a street racer back in the day.

我听说你也曾经在街头比赛的。

Me: 'You coached youth soccer back in the day, right?'

我：“你过去当过足球点教练，对不对？”

But I remember back in the day, people were pretty excited about the T-shirt.

但是回忆以前，人们为T恤衫非常钟情。

Back in the day, I was, uh, dating this guy.

很久以前我和一个家伙好过

I admittedly used to be that guy a little bit, back in the day,

我承认或多或少的我也曾经如此。

I want to understand why people were labeled as vampires back in the day.

我想知道当年那些人为什么被叫做吸血鬼

He reminds me of me back in the day.

他让我想起以前的日子。