1. For weeks, he sat at his table every day and spent an hour or two trying a great number of combinations but he arrived at no result.
    一连几个星期，他每天伏案工作，花上一、两个小时尝试着大量的组合，但毫无结果。

2. For more than half an hour 38 respectable Brooklyn, New York citizens watched a man attack and stab (刺杀) a woman three separate times.
    在半个多小时的时间里，纽约布鲁克林区38名体面的居民旁观了一名男子三次袭击并最终刺死一名女子的过程。