The United Nations was legally obligated to play a role.联合国在法律上有义务发挥作用。

Under a separation agreement, he was obligated to pay his ex-wife £20,000 a year for life.根据分居协议, 他有责任每年向前妻支付2万英镑生活费。

The ruling obligates airlines to release information about their flight delays.这一裁决规定航空公司有义务公布航班晚点信息。