1. The cause of dinosaur extinction is still unascertainable today.

2. Deteriorating time for perishable goods is unascertainable, and the prices of the goods change with the life of the goods.

3. Had the limit not been stated, the rent would have been unascertainable, and the stamp duty would have been ￡2.

4. Introducing ISO9000 to school management has magnificent theoretical implications. Some unascertainable factors, however, have made it hard to put ISO9000 into practice.

5. Watershed flood control engineering system is a complex system consisted of random, fuzzy, unascertainable uncertainties, which has taken up the main part of the flood disaster management.

6. Many things in the new field of Value- Chain Accounting are unascertainable now, one of which is the budgeting for it under the background of Value- Chain Management.