blow off steam

　　(verb phrase)

　　to release frustration or anger that has been building up; also to celebrate or do something in a loud or noisy way

　　EXAMPLE:

　　After a week of negotiations with the union, the workers decided to have a party and blow off steam.

　　blue chip

　　(adj.)

　　a type of stock highly valuesd for its long record of steady or long term earnings; also a valuable property

　　EXAMPLE:

　　The investor bought 100 shares of stock in a blue chip company.

　　bone of contention

　　(noun)

　　a disagreement, dispute, or argument about something; a strong difference of opinion; a conflict

　　EXAMPLE:

　　A bone of contention was the division of powers between the national and provincial governments.

　　brand x

　　a marketing classification describing a product that doesn't have a highly visible or recognized name like a well-known product or "brand name"

　　EXAMPLE:

　　It was decided to buy brand x because it was less expensive.

　　bread and butter

　　(noun)

　　the primary or leading means of financial support, existence, or survival

　　EXAMPLE:

　　Bicycle manufacturing provides the company's bread and butter.

(实习编辑：高奕飞)