名词
中文翻译：投资级
同义词：
['investment grade', 'investment-grade bonds', 'investment-grade securities']
例句：
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1. The company's stock is currently trading at an investment grade.
该公司的股票目前交易在投资级别。
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2.The investment-grade bonds are considered to be a safe investment.
投资级债券被认为是一种安全的投资。
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3. The investment-grade securities are highly sought after by investors.
投资级证券受到投资者的热烈追捧。