Owed; the past tense or past participle of owe.

【废】owe 的过去式及过去分词。

Expressing obligation, fitness, necessity, duty, or probability.

应当；适当；必须；义务；可能(后加不定词)。

Ought expresses moral obligation.

Ought 表道德上之义务：

It may also express strong probability.

此字亦表极大的可能性：

Must denotes compulsion, physical or moral.

Must 指肉体上或精神上之强迫：

Should expresses duty or necessity, but is milder than ought.

Should 指本份或必须，但较 ought 为和缓：

var. of aught.

Aught 的变体。