如果立方体有一个半掩的盖子，您同时可看到其正面和背面，此时同时渲染两面的操作非常有用。
The latter is useful if the cube has a half-open lid and you can see both inside and outside at the same time.
这些只是在过去的3-4天里，增加到我们目录中有用网站及程序的一半而已。
These are just half of the applications that were added to our directory in the last 3-4 days.
虽然如此，也只能比对从案发现场带回来的大约一半的有用组织样品。
Even so, a match can be found for only around half the usable tissue samples taken from crime scenes.
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