有时候不通过长时间研究他们的行为，很难将他们两个区分开。
It is sometimes difficult to tell the two apart without studying their behavior at length.
科学家和研究人员制造C919花了多长时间？
How long has it taken the scientists and researchers to make the C919?
攻读博士学位要花更长时间，这也是研究生院校所能提供的最高学位。
A doctorate can take much longer. It is the highest degree offered in graduate school.
研究者称看太长时间电视对健康极其有害。
Watching too much TV can be deadly even for the healthy, claim researchers.
研究表明，他们会对信息进行更深的处理，更长时间地保存它们。
Research shows they process information more deeply and retain it longer.
有时候，一个名字可能引起我极大的兴趣让我长时间的去研究它。
研究者称看太长时间电视对健康极其有害。
tching too much TV can be deadly even for the healthy, claim researchers.
平时人们生活有所变化都是渐进发生的，但此研究中的变化却是长时间的积累形成的。
People usually make incremental changes, but those add up over time.
调查研究必须提前很长时间进行，并且应当包括甚至是最小细节。
Investigations should be made well in advance and should include even the smallest details.
对饮酒影响健康的方式的研究已经进行了很长时间。
Research into how alcohol consumption affects health has been going on for a long time.
相当长时间以来，现代主义风景园林在园林史研究中都未被充分介绍。
For a long time landscape architecture modernism has been under-represented in Garden History research.
研究发现，长时间来看，大约80%的共同基金表现弱于大盘。
Over time, studies show, about 80% actually under-perform the index.
研究了这么长时间，你就必须得相信这个想法是可行的，而且它最终可以实现。
After such a long time, you have to really believe in an idea and that it can eventually work.
这个研究了很长时间的计划，就是我今天报告的内容。
This project, the result of long elaboration, is the object of my present communication.
研究者花费了很长时间建立理论，但目前为止，仅有一些间接的证据。
Researchers had long theorized as much but until now had only indirect evidence.
该项研究为长时间工作固体火箭发动机燃烧室热防护层设计提供了有效的分析手段。
This research can offer an effective analytical method for long-time working solid rocket motors.
我没有研究了很长时间的科学。
这些成果是对长时间独自苦心研究的恰当回报。
The results were a fitting reward for many lonely hours of study.
这些成果是对长时间独自苦心研究的恰当回报。
The results were a fitting reward for many lonely hours of study.
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