The core language is powerful and very useful for just sitting down and writing good code in.

如果只是想坐下来书写好的代码，该语言的核心是强大的和非常有用的。

youdao

On the other hand, object-oriented programming can be a very useful way to create abstraction, and thus resuable code.

另一方面，对于创建抽象从而创建可重用的代码来说，面向对象的编程可能是非常有用的方法。

youdao

It's great for quickly getting a perspective on the major time sinks in an application's execution, but may not be very useful in actually isolating which code is running slow and can be improved.

它可以很快地让您了解 应用程序中最花费时间的部分，这很不错，但是在实际找出哪些代码运行得慢并且加以改进 这方面不是很有用。

youdao

This chart, very boring and uninteresting but useful to say there are very well defined rules as to when you're writing code, what operators, like what syntax should get evaluated first.

这个图表，看起来很烦，很无趣，但是它很有用,有非常明确的规定,譬如，当你写代码时，就会涉及操作符的优先级。

哈佛公开课 - 计算机科学课程节选