Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
application – n. a computer program that performs a particular task
congestion – n. a crowd of something such as vehicles or people
freeway – n. a wide highway that is built for fast travel
significantly – adv. in a way that is large or important enough to be noticed or have an effect
simulation – n. something that is made to look, feel, or behave like something else especially so that it can be studied or used to train people
visualization – n. a mental picture of someone or something
