Which period of history would you most like to have lived in?
你最喜欢生活在哪一个历史时期？
I couldn't have gone through that bitter period without your generous help.
如果没有你的慷慨相助，我熬不过那段艰苦时期。
During the same period, families have been asked to absorb much more risk in their retirement income.
在同一时期，家庭的退休收入承担了更多风险。
A lot of those cave drawings you have all seen come from this period.
你们看到的很多洞穴壁画都来自这个时期。
Other mechanisms would be more likely to have taken place more gradually, over an extended period, or at different times on different continents.
其他机制更可能是较为循序渐进的，在更长时间段或在不同的大陆上的不同时间发生。
During one lunch period, my friend Denny and I went to the Graben Gore Restaurant to have a hotdog.
在一次午餐期间，我和我的朋友丹尼去格拉本戈尔餐厅吃热狗。
Teachers should have a probationary period of two years.
教师应该有两年的试用期。
Sales have levelled off after a period of rapid growth.
销售经过一段时间的快速增长后呈稳定状态。
Profits have risen by 15 per cent compared with the corresponding period last year.
与去年同期相比利润增长了15%。
I have never seen such a seismic shift in public opinion in such a short period of time.
我从来没有见过公众舆论在这么短的时间内发生如此突然的转变。
When did you last have a period ?
你上一次月经是什么时候？
Historians of the period have not, however, fully exploited literary criticism, due to the disciplinary boundaries that mark contemporary academic research.
但由于标志着当代学术研究的学科界限，针对该时期的史学家还没有充分利用文学批评。
Cave art seems to have reached a peak toward the end of the Upper Paleolithic period, when the herds of game were decreasing.
洞穴壁画艺术似乎在旧石器时代晚期达到了顶峰，而当时猎物的数量正在减少。
Some scientists speculate that Mars may have enjoyed an extended early period during which rivers, lakes, and perhaps even oceans adorned its surface.
一些科学家推测，火星在早期很长时间里可能都有以河流、湖泊，甚至海洋装点着它的表面。
Here are the materials you need to have a successful study period.
这些是你在一段成功的学习期间所需要的材料。
If you want to designate a period, you have to look at tangible things like pottery, particularly painted pottery, because it's easier to categorize.
如果你想标注某段时期，你必须借助有形的事物，就像陶器，尤其是彩绘陶器，因为它们更容易分类。
By 2012, this period of chastisement will likely have run its course, and future-mindedness will be back in vogue, for better or worse.
到2012年，这一时期的惩罚可能会走到尽头，无论好坏，未来观念都将重新流行起来。
These calculations suggest that a period of about one million years would have been required.
这些计算表明，这个过程可能需要大约一百万年的时间。
During one lunch period, my friend Denny and I went to the restaurant to have a hot dog.
一次午餐时间，我和朋友丹尼去餐馆吃热狗。
By dropping out after studying for a period of time, the two students have wasted educational resources, which could have been provided for others.
两名学生学习一段时间后辍学，他们浪费了本可以提供给其他人的教育资源。
The reason London taxi drivers are so efficient is that they all have gone through a very tough training period to get the special taxi driving license.
伦敦的出租车司机之所以效率这么高，是因为他们受到非常严格的训练才获得了专用出租车驾驶执照。
Most historians have underestimated the extent and significance of women's political allegiance in the antebellum period.
大多数历史学家低估了战前妇女政治忠诚的程度和重要性。
During this relatively short period of time, greater changes in people's living conditions have occurred than in the thousands of years which preceded.
在这相对短暂的时间里，人们的生活条件发生了比之前几千年更大的变化。
Leah easily could have fallen into a trap of feeling content; instead, her energy sparked a period of experimentation and renewal.
莉娅本可以轻易地落入满足的陷阱中；但是，她的活力激励她步入尝试和更新阶段。
Such a quantity of material would have blocked the sunlight completely from reaching the surface, plunging Earth into a period of cold and darkness that lasted at least several months.
如此大量的物质会完全阻挡阳光到达地表，使地球陷入至少持续数月的寒冷和黑暗之中。
Paul Wignall and others have found sites where marine fossil deposits reached a peak of diversity at the very end of the Permian period.
保罗·维格纳尔和其他人发现了在二叠纪末期海洋化石沉积达到多样性高峰的地点。
Paul Wignall and others have found sites where marine fossil deposits reached a peak of diversity at the very end of the Permian period.
保罗·维格纳尔和其他人发现了在二叠纪末期海洋化石沉积达到多样性高峰的地点。
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