She failed one of the exam papers, but we ought to make allowance for the fact that she was ill.
她有一门不及格, 但我们必须考虑到她当时有病。
He ought to have kept his promise.
他原本应该遵守自己的诺言。
Regularity ought to be observed, as regularity is very conducive to health.
生活应遵守规律, 因为规律对健康有益。
