[参考答案] B [详细解答] 该例子是属于 词义扩大 ( widening of meaning )的范畴。
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... widened meaning 广义；语义扩大 widening of meaning 词义扩大；引申 wide-scope reading 宽域解释 ...
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And so corporate bond spreads are widening--meaning, corporate IOUs have to show more of a yield premium over Treasurys to attract buyers.
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