low-level language

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ITA's hackers seem to be unusually smart, and C is a pretty low-level language.
ITA似乎有一批非常聪明的黑客，而C语言又是一种很低层次的语言。
blog.sina.com.cn
In this setup, the core application -- often with rather strict performance requirements -- is written in a low-level language, such as C language, to get the most from the hardware.
在此设置中，核心应用程序——通常具有非常严格的性能要求——采用低级语言编写（如 C 语言），以尽可能地利用硬件。
The first one is, whether this is a high-level or low-level language.
第一个是，不管这是一个高级或者是低级的语言。

A low-level language, we used to call this assembly programming, you're down at the level of, your primitives are literally moving pieces of data from one location of memory to another, through a very simple operation.
一个低级的语言，我们曾经将其称为假设编程，你们只是处于用基本要素，把一些数据碎片,从记忆存储器的一个地方，通过简单的操作来转到另外一个地方。
麻省理工公开课 - 计算机科学及编程导论课程节选
The first one is, whether this is a high-level or low-level language.
第一个是，不管这是一个高级或者是低级的语言。
麻省理工公开课 - 计算机科学及编程导论课程节选

While extremely flexible, its programming language, BD-Java, requires lots of low-level code for even the simplest of instructions.
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An assembly language is a low level language and it is tedious to write applications in it compared to high-level languages.
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a language for writing computer programs that is similar to machine code (= a set of numbers that gives instructions to a computer)

a computer programming language that is closer to machine language than to human language &rarrcompare high-level language