Before revision: ", and other similar expressions such as the adjectives glass-half-full or glass-half-empty, are idioms which contrast a pessimistic and optimistic outlook on a specific situation or on the world at large.
After revision: ", and other similar expssions such as the adjectives glass-half-full or glass-half-empty, are idioms which contrast a pessimistic and optimistic outlook on a specific situation or on the world at large.