To figure out why they could go forward but not backward, Dr. Thornton and his colleagues looked closely again at the old and new receptors.
为了找出蛋白功能不能逆转的原因，桑顿博士和同事们又仔细的对比了新老两种受体。
It has three leaflets that function like a one-way door, allowing blood to flow forward into the aorta, but not backward into the left ventricle.
它有三个瓣叶，功能象一个单向们，允许前向血流进入主动脉，但不能返流回左心室。
You made this element optional for backward compatibility, but you'll notice that the optionality of this field is a good idea anyway, because not all addresses have apartment Numbers.
您可以使这个元素为向后兼容的可选项，您会发现这个字段的这个可选性是一个很不错的主意，因为并不是所有的地址都有房间号码。
But I'm not asking you in any way, shape, or form to go backward.
但我不是让你以任何方式、任何形态或形式回到过去。
But if you make minor, backward-compatible changes to your service as described in this paper, being careful not to change behavior, then old clients can still talk with your new service.
但正如这篇文章所述，如果您对您的服务做一些局部的、向后兼容的改变，时刻注意不改变其行为，那么旧客户端仍可以与您的新服务进行通信。
The second is not discussed here, but does present interesting challenges in backward compatibility and flexibility.
这里不讨论第二种选择，但它的确在向后兼容性和灵活性方面提出了有趣的挑战。
Converting existing library classes to work smoothly with generics was no small feat, but as is often the case, backward-compatibility does not come for free.
在转化现有的库类来使用泛型方面没有多少技巧，但与平常的情况相同，向后兼容性不会凭空而来。
It contains many panes not in use but kept for backward compatibility.
它包含许多不再使用但用来后向兼容的窗格。
But if the behavior of the implementation receiving old values changes, than this is not a backward-compatible change.
但是当实现的行为接受了旧值改变时，这就不是向后兼容改变。
This imposes not merely a level of responsibility regarding backward compatibility, but a set of challenges relating to a demanding class of users.
这不仅意味着关于向后兼容的责任，而且是与大量不同类别的用户相关的挑战。
These methods are still supported for backward compatibility in Lotus Connections 2.5, but they should not be used for new widgets.
这些方法在LotusConnections 2.5中仍然受到向后兼容性支持，但不应该在新的小部件中使用它们。
Backward compatibility with JBoss-specific features is ensured in our Enterprise offerings but not always in the upstream project releases such as this one.
我们的企业版可以保证新版本能向后兼容于JBoss的具体特性，但上面的项目却不一定，比如这次。
You can also mount an ext4 file system as ext3 (backward compatible), but only if the ext4 file system does not use extents (which is discussed in the performance section).
您还可以将ext4挂载为ext3（向后兼容），但前提是 ext4文件系统不能使用区段（将在性能小节对其进行讨论）。
After looking at the photos, they were asked to count backward from 8, 211 by 7s, then look at another picture of a person they knew but were not in love with, then count backward again.
看完照片之后，他们被要求从8211开始倒数，每隔7个数数一次，数完后再看另一个人的照片，他们与此人相识但不相爱，然后再倒数。
Chin describes the work as "very interesting" but says he is not yet convinced that such backward lasing could actually be used to detect pollutants and other gases.
Chin称这个工作“非常有趣”，但他也说他还并不确信这种后向激光能确实地用来探测污染物质和其它气体。
Behold, I go forward, but he is not there; and backward, but I cannot perceive him.
只是，我往前行，他不在那里，往后退，也不能见他。
Most recommendation engines work backward instead, using information that comes not from the art but from its audience. (See the 50 best websites of 2009.)
取而代之，大多数推荐引擎采用了倒推的工作方式，它们推荐所凭借的信息并非来自艺术作品，而是源自艺术作品的受众。
Is: yeah, if not the plane, the United States as well as building not backward, but 9.11 happen for more than a year, the United States had no grounded.
正：是呀，如果没有飞机，美国的大楼也一样不会倒，但9.11发生一年多来，美国的飞机都没有停飞过。
Move backward to the next Wiki link or URL, cycling if necessary. This function is not entirely accurate, but it's close enough.
向后移动到下一个链接或URL，如果需要将会循环。这个函数不完全精确，但非常接近。
For this kind of inexplicable would not like to go school or scores of backward, but after period of time could normal academic teenagers, experts remind parents be especially vigilant.
对于这种莫名不愿上学或成绩退步，但过段时间又会正常进行学业的青少年，专家提醒家长要特别警惕。
Then slowly he began to walk, not forward or backward, but in the same place, in the center of the log.
他开始慢慢走动，但并没有向前或向后，而是在圆木中间走动。
The steps are slower than others, the nation has one of the biggest advantages - backward, but not stubborn.
这个步子比别人慢半拍的民族有一个最大的优点——落后但不固执。
Poor represent not backward, but will give busy laying.
贫困代表的不是落后，而是将要给繁华奠基。
You can not aggressive, but can't step backward.
你可以不进取，但不能倒退。
Backward-facing step flow is not only a typical example of complex separated flow of fluid dynamics, but also a class of common flow phenomena in many engineering fields.
后台阶流动不仅是流体力学中复杂分离流的一个典型例子，同时也是许多工程领域中一类常见的流动现象。
The water resource of towns in Qianjiang was rich but its exploitation was backward, the system of greenbelt was not fully developed and the street landscape was inartistic.
潜江小城镇的水资源丰富但开发落后，绿地系统不完善，街景缺乏艺术性。
China may be backward in economic and cultural development, but it is not necessarily backward in everything.
中国在经济上文化上落后，并不是一切都落后。
China may be backward in economic and cultural development, but it is not necessarily backward in everything.
中国在经济上文化上落后，并不是一切都落后。
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