Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
compound subject – n. a type of subject where two or more individual noun phrases are coordinated to form a single, larger noun phrase.
gerund – n. verbal that ends in -ing and functions as a noun.
collective noun – n. a noun which refers to a collection of things taken as a whole.
foundation – n. something (such as an idea, a principle, or a fact) that provides support for something
tunnel vision – n. (idiomatic). a narrow field of vision that does not see the full view
