retroactively造句

1、Bill Venners: What is the business case to add tests retroactively if you have no tests currently?
比尔：如果你目前没有任何测试，那么还有必要追加测试么？

2、Time stamps are not retroactively updated to reflect changes in the system time.
不会以追溯方式更新时间戳来反映系统时间的更改。

3、The new rules wouldn't be applied retroactively to companies that have already received aid.
新规定可能不会往前适用于已经接受救助的公司。