有義務(wù)being compelled by law, etc.
be under an obligation to sth
She is under an obligation to her adoptive mother.
她有義務(wù)贍養(yǎng)她的養(yǎng)母。
be under an obligation to-v
Every player is under an obligation to keep the rules.
每個(gè)選手都必須遵守這些規(guī)則。
lay〔place〕 sb/sth under an obligation
The court laid the young thief under an obligation to report to the police station once a week.
法院強(qiáng)迫那個(gè)小偷每周向警察局報(bào)到一次。
Their frequent invitation places us under an obligation to invite them to our house for a change.
他們經(jīng)常邀請(qǐng)我們,我們只好禮尚往來邀請(qǐng)他們到我們家。