56. Supporters of the Star Wars defense system hope that this would not only protect a nation against an actual nuclear attack, but would be enough of a threat to keep a nuclear war from ever happening.

56、星球大戰防御系統的支持者們希望它不僅能保護一個遭受核攻擊的國家，也希望它能成為使核攻擊永不發生的足夠威脅。

57. Neither would it prevent cruise missiles or bombers, whose flights are within the Earth's atmosphere, from hitting their targets.

57、它也不能防止軌道在地球大氣層以內的洲際導彈和轟炸機命中目標。

58. Civil rights activists have long argued that one of the principal reasons why Blacks, Hispanics, and other minority groups have difficulty establishing themselves in business is that they lack access to the sizable orders and subcontracts that are generated by large companies.

58、人民活動家一直認為黑人和拉丁美人難以在生意上立足的原因是因為他們難以取得大公司的大宗定單和分包合同。

59. During the nineteenth century, she argues, the concept of the "useful" child who contributed to the family economy gave way gradually to the present day notion of the "useless" child who, though producing no income for, and indeed extremely costly to its parents, is yet considered emotionally "priceless".

59、她認為十九世紀給家庭經濟作出貢獻的孩子才“有用”的概念慢慢改變了，今天提到那些沒有掙取收入的“無用”孩子，甚至還要花銷很多，仍然在情感上被認為是無價的。

60. Well established among segments of the middle and upper classes by the mid-1800's, this new view of childhood spread throughout society in the late nineteenth and early twentieth centuries as reformers introduced child labor regulations and compulsory education laws predicted in part on the assumption that a child's emotional value made child labor taboo.

60、這種關于孩子的觀點到19世紀時已在中上階級中建立，并于19世紀末20世紀初在社會上廣泛傳播，當時改革者們推行童工規定和義務教育法，部分來源于孩子的情感價值的假設，這都使得使用童工被禁止了。