■ readership

是个集合名词（“读者群”），只能单数，语法功用类似 population。

• a readership estimated at 16,000,000估计达一千六百万人的读者群。

• assure 与 ensure
• astonish
• astound
• as well
• as well as
• as well...as
• as with
• at
• at
• at all
• at issue
• atmosphere
• at once
• at one's peril
• attention
• attention 与 caution
• at that
• at the cost of
• at the expense of
• attitude
• attitude
• attitude 与 posture
• attorney
• at..., we
• at 与 in