11. seatbeltn. a safety belt used in a car or plane to hold you in your seat in case of an accident 飞机、汽车等的安全带
e.g.: Fasten your seatbelt!
12. shoulder-strapn. narrow strip of material that goes over the shoulder to support a bra, nightdress, etc. 保护肩膀的肩带
e.g.: The dress’s shoulder-strap was broken.
13. enhancevt. Increase(the good qualities of sb / sth), make (sb / sth)look better增强某人的优点，使某人看起来更好
e.g.: Those clothes do nothing to enhance her appearance.
派生词汇 enhancement n. 增加，提高
14. overpowervt. Be too strong or powerful for sb by greater strength or numbers 强得使某人承受不住，以力量或数量战胜某人
e.g.: The police easily overpowered the burglars.
派生词汇 Overpowering adj. 不可抗拒的;压倒(优势)的;极强大的
15. ergonomicsn. study of work and working conditions in order to improve people’s efficiency 工效学，工作环境改造学(与单词动词连用)
e.g.: He is an expert at ergonomics.
派生词汇 ergonomist n. 工作环境改造学家，生物工艺学家 ergonomic (ergonomical) adj. 人机工程学的，人与机械控制的
Exercise从以上单词中选出最恰当的词，填入空格内。
He was __1__to vote, because he didn’t belong to the club.
The criminal wad told he would be __2__from punishment if he helped the police.
__3__ activities are lawful in many countries.