This crisis might last for a long period of time.

此次危机可能会持续很长一段时间。

Smoking a lot of cigarettes can harm and even kill over a long period of time.

长期大量吸烟会危害身体健康，甚至导致死亡。

Oil or vinegar based salad can be stored for a long period of time without refrigeration.

含油或醋的沙拉可以储存很长一段时间，而且不需要冷藏。

The bar was formed by the mud and sand deposited here over a long period of time.

河里的泥沙淤积在这里，年深日久便成了沙洲。

Ever leave an expense report undone for a long period of time?

有没有长时间的搁置一份费用报表呢？