[] () used to describe companies, bonds, etc. that are fairly safe to invest in because they have a low risk 投资级的（因低风险而使投资安全的公司、债券等）◆The company's credit rating is now investment grade. 这家公司的信用评级现在已达到投资级。◆investment-grade debt (= that is likely to be paid back) 投资级的债务（即有可能得到偿还）◆More than $28 billion of new investment-grade bonds have been sold in the past two weeks. 在过去的两个星期内，销售了 280 多亿元的新投资级债券。