one in five意思是五分之一
例句:The condition affects one in five women.
每五个妇女就有一个人患有这种病。
one out of five 意思是五个一
例句:Studies
show that one out of five Americans working near a color copier will casually
try making a copy of a bill. 研究表明,在彩色复印机近旁工作的五个美国人中有一个会有意无意地试着复印钞票。