过去四年我尽了自己的一份力量，现在轮到你来养活她了。
I have done my share these last four years and now it is your turn to provide for her.
一旦语言从2岁左右开始发展，他们就有了一个符号表征系统，可以谈论过去和现在环境之外的事情。
Once language starts to develop from about age 2, they do have a system for symbolic representation and can talk about things which aren't in their immediate environment including the past.
学生们过去发挥了重要的作用，但现在，他们不再重要了。
Students have played an important role in the past, but for the moment, they're on the margins.
Ihave eaten是动词eat的现在完成时；Ihad eaten是过去完成时；Iwill have eaten是将来完成时。
'I have eaten' is the present perfect tense of the verb 'to eat', 'I had eaten' is the past perfect and 'I will have eaten' is the future perfect.
过去她为我工作，而现在我们的地位对调了。
She used to work for me, but our situations are now reversed.
现在的行为标准和过去不一样了。
我们现在使用拖拉机的地方，很明显过去使用的是马。
Where we use tractors, obviously they used cart horses in those days.
在过去，我们必须斟酌平衡自己的饮食，但现在我们正在打破这种平衡。
In the past we had to have a taste trade-off, but we're breaking that trade-off.
有些人相信过去发生或现在发生的一切将来都会重演。
Some people believe whatever has happened before or is happening now will repeat itself in the future.
通过阅读，他们发现了生命更深层次的意义，书让他们对过去和现在的生命有所了解。
Through their reading they find a deeper significance to life as books acquaint them with life in the world as it was and it is now.
我想告诉你们有关人口数量的过去、现在和未来。那么让我们从一些问题入手。
I want to tell you about the past, present and future of the human population. So let's start with a few problems.
汽车工人家庭的其他成员可能不太愿意用现在交换过去。
Other members of the autoworker's family might be less inclined to trade the present for the past.
然而，汽车工人家庭的其他成员可能不太愿意用现在交换过去。
Other members of the autoworker's family, however, might be less inclined to trade the present for the past.
它使用定量数据和数学模型作为分析工具，研究这些人口在过去、现在和未来的情况。
It studies these populations in the past, present and future using quantitative data and mathematical models as tools of analysis.
它使用定量数据和数学模型作为分析工具，研究这些物体在过去、现在和未来的数量。
It studies these populations, in the past, present and future, using quantitative data and mathematical models as tools of analysis.
我想告诉你们关于人类的过去、现在和未来的事情，所以让我们从一些问题入手。
I want to tell you about the past, present and future of the human population, so let's start with a few problems.
当高中生进入大学时，他们过去和现在的阅读习惯将会影响他们的学业表现。
When high school students go on to college, their past and current reading habits will influence their academic performance.
我过去常写信与我的朋友联络，而现在有了互联网就更方便了。
I used to correspond with my friends by letters while now the Internet is more convenient.
与过去略有不同的是，现在人们更愿意接受如感恩节和圣诞节等西方节日。
Slightly different from that in the past, people now are more open to western festivals like Thanksgiving Day and Christmas.
现在我害怕回顾过去，因为过去的生活就像一个可怕的梦。
Now I am afraid of looking back since the past life seemed like a horrible dream.
你可能会对你的过去感到内疚，但这是在用无法改变的事和境况来荼毒你的现在。
You may feel guilt over your past, but you are poisoning the present with the things and circumstances you cannot change.
当你买百吉饼的时候，过去你会买到这么大的，而现在你买到的真的要大得多。
When you get a bagel, it used to be you'd get something this size, and now you get something that's really, really much bigger.
新的一年即将来临，现在是我回顾过去的日子并制定计划、不断进步的时候了。
The new year is around the corner, so it is time for me to look back on the past days and make plans to improve myself.
现在，新的证据显示，在过去130万年中，全部的南极冰盖或其中大部分至少都崩塌过一次。
Now, new evidence reveals that all or most of the Antarctic ice sheet collapsed at least once during the past 1.3 million years.
价格过去过高、现在仍然过高的真正原因很复杂，简短的讨论并不能满意地解释这个问题。
The real reason why prices were, and still are, too high is complex, and no short discussion can satisfactorily explain this problem.
克里斯托夫和其他人总是把他们想象中的我们现在或过去的生活浪漫化，我不会拿它去换其他的东西。
Kristof and others constantly romanticize the life they imagine we live, or used to live, and I wouldn't trade it for any other.
人们旅行去看外国的建筑、食物、民族服装，因为他们认为这些在过去与现在不同。
People traveled to see the buildings, the food, the national dresses in foreign countries because they thought they would not be the same as those of their own countries in the past.
青少年的衣服尺寸改变了。现在小号的衣服过去是中号。
青少年的衣服尺寸改变了。现在小号的衣服过去是中号。
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