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===== Variables =====

==== What is it? ====
A variable is a named storage location in memory that can hold a value that may change.

==== What is it used for? ====
Store data such as inputs, configuration, and computed results.

==== Example ====
<code go>
var age int = 18
name := "Phong" // short declaration
const Pi = 3.14 // constant

_ = age
_ = name
_ = Pi
</code>

==== Notes ====
  * `:=` can only be used inside functions.
  * Go has zero values: if you don't assign, the variable gets a default value.

==== Hard words (English) ====
  * **variable** /ˈveriəbəl/: biến
  * **storage** /ˈstɔːrɪdʒ/: lưu trữ
  * **memory** /ˈmeməri/: bộ nhớ
  * **short declaration** /ʃɔːrt ˌdekləˈreɪʃən/: khai báo rút gọn
  * **zero value** /ˈzɪroʊ ˈvæljuː/: giá trị mặc định