used to 过去一向，过去时常，过去曾（而现在不再）做
We used to compete on just cost.
我们曾经仅仅在成本上竞争。
I used to love every day.
我以前可是天天都喜欢的。

be allowed to 被允许
Shouldn't china be allowed to do the same thing?
为什么中国不应该被允许做同样的事情呢？
Second, executives should only be allowed to sell after earnings releases, not before.
其次，只允许高管在业绩发布后（而非之前）售股。