In everyday life this perceptual bias is useful; it is what normally allows you to understand how distant objects occupy space.

在日常生活中知觉偏差是很有用处的，这能让你判断出一个物体的长度，宽度和高度。

youdao

This line is useful because it tells us how much of the heap is free and that there are objects being cleaned up and not pinned to the heap.

这一行非常有用，因为它告诉我们这个heap有多少是空闲的，而且有一些对象正在被清理且不会占用这个heap。

youdao

This internal part of message Broker product is not exposed to developers, but it is useful to see how it works so that you can understand the architectural scalability of message flows.

Message Broker产品的这个内部组件不会公开给开发人员，但是了解它的工作方式将非常有用，您可以通过它了解消息流的架构可扩展性。

youdao

And I don't quite remember from reading or from class how big these things are, well, it turns out -- and this is sometimes useful, later on more likely than now -- but C has a size of operator that takes an argument in parenthesis and it will tell you how much space is used to store that particular data type.

我不太记得类中的这些类型,是多大的，嗯，结果是--这个在以后比现在，可能是更有用的--不过C语言中有个sizeof的操作符,其中括号里有一个参数,它会告诉我们，要存储一个类型的数据,需要占用多大空间。

哈佛公开课 - 计算机科学课程节选

To get a sense of how unprecedented this is, it is useful to consider the American Jewish community's response to Jews for Jesus.

CENTERFORSECURITYPOLICY: American Jewry's fight

But rarely are we given a critical overview of what we actually know and how useful this information is for the prevention of breast cancer.

FORBES: After 40 Years Of Research, What Do We Know About Preventing Breast Cancer?

What is clear is that much useful information is being gleaned about how to deal with a disaster of this kind, which can be expected to happen again, and other kinds of spills, as the prospect of deep-water drilling for oil is realised.

FORBES: Blame Big Bad BP For Now, but Where Is the Next Oil to Come From?