1817年，在第一次移民大潮中，一位英国游客观察到：“古老的美洲似乎正在分裂并向西移动。”
"Old America seemed to be breaking up and moving westward," observed an English visitor in 1817, during the first great wave of migration.
今年8月，当她第一次意识到自己有问题了的时候，她在雅虎的一个网瘾小组上贴出了一条信息，标题是：我有网瘾。
In August, when she first realized she had a problem, she posted a message on a Yahoo Internet addiction group with the subject line: I have an Internet Addiction.
当一个来自像越南这样温暖的国家的学生在秋天第一次到加拿大时，他首先感觉到寒冷。
When a student from a warm country like Vietnam comes to Canada in the autumn for the first time, he feels cold at first.
从他们第一次交换信件到马丁到达美国，这段时间持续了六年。
It lasted six years from their first exchange of letters to Martin's arrival in the United States.
从希腊时代到第一次世界大战，它的工作很简单：与致命疾病和严重残疾作斗争，确保生育以及减少病痛。
From the Greeks to the Great War, its job was simple: to struggle with lethal diseases and gross disabilities, to ensure live births, and to manage pain.
汹涌的海水冲进硬化的盐滩，把它们冲开，并将它们磨碎成卵石，这些卵石就是在“挑战者”号第一次取到的样本中观察到的卵石。
Turbulent waters tore into the hardened salt flats, broke them up, and ground them into the pebbles observed in the first sample taken by the Challenger.
农业让人们第一次体验到技术改变生活的力量。
Agriculture gave people their first experience of the power of technology to change lives.
孩子们在3岁的时候第一次被组织到实验室，讨论他们过去印象深刻的事情，比如第一次和家人的放松旅行，第一次遇到的跳舞失误，以及第一天上学等等。
The children were organized to the laboratory for the first time at the age of 3 and discussed impressed things from their past, such as the first relaxing trip with your family, the first dancing accident you met, and the first day of school.
就在这时，我第一次注意到这个男孩看不见，因为他是盲人。
Just then, for the first time, I noticed that the boy could not see because he was blind.
2008年我父亲得了脑癌，那是我第一次认识到“科技安息日”的重要性。
I first understood the importance of "Technology Shabbat" in 2008, when my father had got brain cancer.
去年6月，她第一次在互联网上了解到跑步捡垃圾运动，并决定付诸行动。
Last June, she first learned the idea of plogging on the Internet and decided to plog.
穿一套漂亮的西装，打一条领带，第一次见客户时，你一定要准时到，好吗？
Wear a nice suit and a tie, and you first meet the customer, you should be sure to arrive on time for a meeting, OK?
我们都很乐意想到现在读这个故事的孩子们，当他们第一次读到时，意识到曾经在很短的时间里，在一个很小的地方，有一群没有偏见的人创造了一个关于对别人的爱和善意的动人的故事。
We both love thinking of the children reading the story today, coming to it for the first time and realizing that once, for a short time and in a small place, a group of prejudice-free people created a touching story of love and kindness towards others.
当我第一次到芝加哥，他们做得还不够好。
这是我第一次尝试使用索引卡片法。我注意到脑海里有一个心灵之声。
The first time I tried the index card method, I noticed an inner voice in my head.
第一次从新德里到北京的旅程，真是我人生中一大盛事！
That was my first trip from New Delhi to Beijing. What a wonderful event in my life!
当你第一次意识到这个事实的时候你定会感到很惊异。
The first time you become conscious of this truth, it's bound to come as a shock.
然而，当分析这段代码时，您会意识到只有在第一次调用方法时才需要同步。
However, when you analyze it you realize that synchronization is required only for the first invocation of the method.
这是我们第一次感觉到这是一个公正的选举，所以我们想要参加投票。
This is the first time that we feel like we are looking at a fair election, so we want to vote.
当你去尝试新鲜的事时，你必需要意识到，你的第一次尝试将会以失败告终。
When you try something new, you need to realize that you're going to fail at first.
当我第一次读这本书的时候，我在想，“天哪，我之前怎么没有意识到这些呢？”
When I first read this book, I thought "My god, how could I have not realized this before?"
这是士兵们第一次在阿富汗开火，在几分钟后，叛军逃散到丛林里，战斗结束。
Thefirefight, the platoon’s first in Afghanistan, was over in minutes as theinsurgents scattered into the woods.
到2020年左右，全球生育率将第一次低于全球生育等值替换水平。
By about 2020, the global fertility rate will dip below the global replacement rate for the first time.
科学家第一次观察到海豚的这种行为是在2007年和2009年。
Scientists first observed dolphins engaging in these behaviors in 2007 and 2009.
他们可能会第一次意识到，他们面对的挑战并不只是他们这个家庭独有的。
For the first time, they may realize the challenges they're facing aren't unique to their family.
如果从没锻炼过，第一次慢跑后，你可能不会感觉到压力奇幻般的减轻。
You may not feel a magical reduction of stress after your first jog, if you haven’t been exercising.
青少年可能在第一次就注意到，他们和父母和家庭的距离感。
Teens also may notice, for the first time, a sense of distance from parents and family.
青少年可能在第一次就注意到，他们和父母和家庭的距离感。
Teens also may notice, for the first time, a sense of distance from parents and family.
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