正black spot n. center of poverty, danger, disturbance; a difficult place, or situation贫困、危险,问题较多的地方-unemployment black spots (American Speech, Fall 1987) bread and butter a. long-standing, reliable (source of business, profit, etc.)可靠的,能保证长期收入的- Yet the Bank of England ... is happy to let them rebuild their balance sheets at the expense of their bread and butter customers (The Sunday Times, 26.5.91)- ... bread and butter TV programs (= long-running programs, e.g. soap operas, serials, etc.)
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