TASK DEFINITION: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
PROBLEM: Substance abuse , or drug abuse , happens when a person uses a drug over and over again , in ways that hurt their health .

SOLUTION: Substance abuse , also known as drug abuse , is a patterned use of a drug in which the user consumes the substance in amounts or with methods which are harmful to themselves or others , and is a form of substance-related disorder .

PROBLEM: In practice , the role of head of state of Australia is divided between two people , the Queen of Australia and the Governor-General of Australia .

SOLUTION: In practice , the role of head of state of Australia is divided between two people , the Queen of Australia and the Governor-General of Australia , who is appointed by the Queen on the advice of the Prime Minister of Australia .

PROBLEM: APK is the file format that software for Android is distributed in .

SOLUTION:
Android Package ( APK ) is the package file format used by the Android operating system for distribution and installation of mobile apps and middleware .