The project must be completed within a specific time span.
这项工程必须在规定期限内完成。
英语解释：the length of time that sth lasts or is able to continue 持续时间
,
The project must be completed within a specific time span.
这项工程必须在规定期限内完成。
英语解释：the length of time that sth lasts or is able to continue 持续时间
,
