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Establishing the importance of the topic
- It is becoming increasingly difficult to ignore the …X is the leading cause of death in western industrialized countries.X is a common disorder characterized by …Xs are one of the most widely used groups of antibacterial agents and …Xs are the most potent anti-inflammatory agents known…X is an important component in the climate system, and plays a key role in Y.In the new global economy, X has become a central issue for …In the history of development economics, X has been thought of as a key factor in …
The issue of X has received considerable critical attention.
X is a major public health problem, and the cause of about 4% of the global burden of disease.
X is an increasingly important area in applied linguistics.
Central to the entire discipline of X is the concept of …