The healthcare industry is often considered recession-proof because people always need medical services.

recession-proof 是由名词 recession（经济衰退）和形容词 proof（防...的、抗...的）组成的复合形容词。proof 作为后缀时表示"能抵抗某种影响的"。 recession-proof 字面意思是"能抵抗经济衰退的"，引申为"不受经济衰退影响的"，即"抗衰退的"。