significantly /sɪɡˈnɪfɪkəntli/ adv.显著地；明显地；有重大意义地
The hunter-gatherers walked barefoot for long distances every day over natural terrain (地形).Their ankles were relatively flexible.In contrast, people living in big cities, who wear constrictive (束紧的) footwear and walk short distances on flat surfaces like asphalt (柏油) roads, had more rigid ankles.
flexible /ˈfleksəbl/ adj.灵活的；可变动的；柔韧的；有弹性的
in contrast 相比之下；相反
flat /flæt/ adj.平坦的，水平的
rigid /ˈrɪdʒɪd/ adj.僵直的；死板的；僵硬的；坚硬的
人教高中英语单词mp3
人教版初中英语单词表
人教版高中英语音频
press somebody to do something 催促某人做某事
the press 新闻界
under pressure/stress 在压力下
be particular about 对…挑剔
in particular =particularly 特别地；尤其地
(somebody) be familiar with something 某人对某物/某事熟悉
(something) be familiar to somebody 某物/某事为某人所熟知
in case +句子 以防万一…
in case of+n./doing 万一…
in any case 无论如何；不管怎样
Changes to ankle bones take place over the course of a person’s life, and there is no evidence that these alterations (改变) can be passed on genetically.
course /kɔːs/ n.进展；进程
pass on 传给；递给；转交
genetically /dʒəˈnetɪkli/ adv.基因地；遗传地
It is an open question whether shoes have disadvantages, but Sorrentino suspects that the rigidity of modern shoes causes our bones to become weaker and more prone to fracturing (骨折).
suspect /səˈspekt/ vt.疑有，觉得（尤指坏事可能属实或发生）；怀疑；不信任
in no case 绝不（位于句首，要部分倒装）
in no way
by no means
on no account
identity n.身份；个性— identify v. 确定；鉴定；识别；辨认出；认同—identification n. 鉴定；识别；认同；身份证明
identity card 身份证
in cash 用现金
by credit card 用信用卡
with the money 用钱
update somebody on something 向某人提供最新信息
I was wearing a seatbelt. If I hadn’t been wearing one, I ____.
A. were injured
B. would be injured
C. had been injured
D. would have been injured
Had the governments and scientists not worked together , AIDS-related deaths _______ since their highest in 2005.
A. had not fallen
B. would not fall
C. did not fall
D. would not have fallen
