他的身体素质一直很差，终年疾病不断。

[误] He has got very poor physical quality with continuous illnesses all the year round.

[正] He has got very poor physical constitution with continuous illnesses all the year round.

注：虽然“素质”常翻译成 quality，例句欣赏：Do you think she possesses the necessary managerial qualities to do this job?(你认为她具有从事这个工作所必须的管理素质吗?)但“身体素质”却要用 physical constitution(体格)来表达。