This is the only effectual way to secure our present and future happiness.
这是确保我们现在和未来幸福的唯一有效途径。
One must apply oneself to the present and keep one's eyes firmly fixed on one's future goals.
人们必须让自己立足于现在，把眼光坚定地锁定未来目标。
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，研究这些人口在过去、现在和未来的情况。
I want to tell you about the past, present and future of the human population, so let's start with a few problems.
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.
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。
The car of the future should be far more pollution-free than present types.
未来的汽车应该比现在的汽车还要低污染。
We are guided by a belief that good things will happen for us in the future if we take proper care of the present.
我们被这样一种信念指引着：如果我们过好现在的生活，未来就会有好事发生。
If the past is prologue, then it ought to be possible to draw some modest conclusions about the future from the wealth of data about America's present.
如果过去是一个序幕，那么应该有可能从有关美国现状的大量数据中得出一些关于未来的适度的结论。
We need an acknowledgement of our present ecological plight but also a language of positive change, visions of a better future.
我们需要承认我们目前的生态困境，但也需要一种积极改变的态度，拥有对更美好的未来的愿景。
Happiness is not a point of future and not a moment from the past, but a mindset that can be designed into the present.
幸福不是未来的某个节点，也不是过去的某个时刻，而是能够融入到当下的一种心境。
Where are you in the cycle of renewal: Are you actively preserving the present, or selectively forgetting the past, or boldly creating the future?
你处于更新周期的哪个阶段：是积极维持现状，还是选择性忘记过去，又或是大胆创造未来？
'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.
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。
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