In the absence of good scientific trials, it is impossible to be certain which is which.
在缺乏良好的科学试验的情况下，是不可能确定哪些有效哪些无效的。
The problem for America in Iraq is that it is agonisingly difficult to tell which is which.
而对于驻伊美军来说，区分二者则是让人头疼的问题。
With multiple return values, it is good to have the code document which is which - go allows you to give the return values names, just like parameters.
有了多个返回值，有良好的代码文档会更好——而Go允许你给返回值命名，就像参数一样。
A major enhancement in DB2 9.7 is the ease of moving back and forth between SQL data and XML data-developers don't need to know which is which and can develop with whatever tools they prefer.
DB 2 9.7中的一项重大改进是简化了SQL数据和XML数据之间的转移，开发人员不再需要了解细节，可以用他们喜欢的任何工具进行开发。
The Teenage Mutant Ninja Turtles are named after four Renaissance artists: Leonardo da Vinci, Michelangelo, Raphael, and Donatello. Do you still remember which is which?
忍者神龟都是以文艺复兴时期的艺术家的名字命名的：达芬奇，米开朗琪罗，拉斐尔，还有多纳泰罗。你还记得谁是谁吗？
My umbrella and my brother's are so alike that I can't tell which is which.
我的伞和哥哥的伞太像了，我分不出哪把是哪把。
Teacher: Here are two birds, one is a swallow, the other is sparrow. Now who can tell us which is which?
老师：这里有两只小鸟。一只是燕子。另外一只是麻雀。现在谁能告诉我哪一只是哪一只？
I've a good idea. Just give them different names and when they can talk, they can tell you which is which.
我有个好主意，给她们起不同的名字，等她们学会说话时，就能告诉你她们是谁。
When asked how he could tell the difference, the saint said that you can only tell which is which by the way you feel after the creature has left your company.
当圣人被问及如何区分其差别，他说，只有在那东西离开你身边后，你才分辨得出何者是何者。
In selecting the site of the Olympic Games, the IOC considers a number of factors, chief among which is which city has, or promises to build, the best facilities.
在挑选奥运会举办地的过程中，奥委会会考虑很多因素，其中最主要的是哪个城市已有，或者承诺修建最好的设施。
After a good deal of arguing they agreed to put on their green rings (" green for safety, "said Digory," so you can't help remembering which is which ") and hold hands and jump.
经过一番争执，他们都同意戴上绿戒指“绿色是安全色，”迪格雷说，“这样，你怎么都能记住哪枚戒指派什么用场。”
After a good deal of arguing they agreed to put on their green rings (" green for safety, "said Digory," so you can't help remembering which is which ") and hold hands and jump.
经过一番争执，他们都同意戴上绿戒指“绿色是安全色，”迪格雷说，“这样，你怎么都能记住哪枚戒指派什么用场。”
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