12:45的英文：a quarter to thirteen。
quarter：n. 四等份之一;(正点之前或之后的)15分钟，一刻钟;三个月时间;季度;季。
thirteen：num. 十三。
相关介绍
Sales for this quarter have dipped from 38.7 million to 33 million.
本季度销售额从3870万下降到3300万。
The company lost$ 7 million this quarter in contrast to a profit of$ 6.2 million a year earlier.
这家公司本季度亏损了700万元，与去年同期620万元的赢利形成了对照。
Support for the plan came from an unexpected quarter.
支持这一计划的是没料想到的一方。
My son's thirteen but he's young for his age.
我儿子十三岁了，但他比实际年龄显得小。
Thirteen is often considered an unlucky number.
十三常被认为是不吉利的数字。
During the expedition, they trekked ten to thirteen hours a day.
在探险期间，他们每天都要走十到十三个小时。
