Theoretically, a line can extend into infinity.

从理论上来说直线可以无限地延伸。

The government can’t expect the taxpayer to bail this company out indefinitely.

政府能指望纳税人无限期地帮助这家公司摆脱困境。

The event has been postponed indefinitely due to lack of interest.

由于反应淡，这一活动被无限期地搁置了。