翻译下列句子：1、The only language a computer can understand is machine language.2、An assembly language uses symbols to represent various machine language instructions.3、Assembly languages are also called symbolic languages.4、A high-level language focuses on problem-solving. C, C++, Pascal, Python, LISP, Prolog, FoxPro, Delphi and VC are all high-level languages.5、Two methods are used for source program to object program’s translation: compilation and interpretation.6、There are four categories of computer languages: procedural (imperative), object-oriented, functional, and declarative.7、A procedural program is composed of one or more units or modules. FORTRAN, COBOL, BASIC, C, Pascal and Ada are all procedural languages.8、In object-oriented programming, the objects and the operations to be applied to them are tied together. Smalltalk, C++, Visual Basic, C# and Java are all object-oriented languages.9、Functional programming languages define programs and subroutines as mathematical functions. LISP and Scheme are functional languages.10、Declarative languages describe a problem rather than defining a solution. Prolog is a declarative language.11、Native application of iOS must be written in Swift or Objective-C.12、Some common concepts in procedural language include identifier, data types, variable, constant, input and output, expression, statement and function.13、In the programming process, you must be thoughtful to avoid various mistakes.